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Python : I wish to drop rows where the rows just before and just after has the same value for the column num2.My dataframe looks like this : And this is my target : What I have tried : Giving : And I was thinking to use the new num1_diff column to do the filtering.Is this a good approach , or is there perhaps a better ... | Conditionally drop Pandas Dataframe row |
Python : I am searching a string by using re , which works quite right for almost all cases except when there is a newline character ( \n ) For instance if string is defined as : Then searching like this re.search ( 'Test ( . * ) print ' , testStr ) does not return anything.What is the problem here ? How can I fix it ?... | Splitting a string by using two substrings in Python |
Python : I am using the wave library in python to attempt to reduce the speed of audio by 50 % . I have been successful , but only in the right channel . in the left channel it is a whole bunch of static.why is this ? since I am just copying and pasting raw data surely I ca n't generate static ? edit : I 've been looki... | my program reduces music speed by 50 % but only in one channel |
Python : How I can do for do this code efficiently ? I think must be a efficient way to do this with a numpy library ( without loops ) . <code> import numpy as nparray = np.zeros ( ( 10000,10000 ) ) lower = 5000 higher = 10000 for x in range ( lower , higher ) : for y in range ( lower , higher ) : array [ x ] [ y ] = 1... | Assign values to array efficiently |
Python : Here is an simple example that gets min , max , and avg values from a list.The two functions below have same result.I want to know the difference between these two functions . And why use itertools.tee ( ) ? What advantage does it provide ? <code> from statistics import medianfrom itertools import teepurchases... | tee ( ) function from itertools library |
Python : Suppose we have a class we want to monkeypatch and some callables we want to monkeypatch onto it.Even though baz is a callable , it does n't get bound to a Foo ( ) instance like the two functions bar and wrapped_baz . Since Python is a duck-typed language , it seems strange that the type of a given callable wo... | Why do n't non-function callables get bound to class instances ? |
Python : QuestionI have a dataframe untidywhere the values in the 'attribute ' column repeat periodically . The desired output is tidy ( The row and column order or additional labels do n't matter , I can clean this up myself . ) Code for instantiation : AttemptsThis looks like a simple pivot-operation , but my initial... | Pivot a two-column dataframe |
Python : I was going through the topic about list in Learning Python 5E book.I notice that if we do concatenation on list , it creates new object . Extend method do not create new object i.e . In place change . What actually happens in case of Concatenation ? For exampleAnd if I use Augmented assignment as follows , Wh... | Python Lists : Why new list object gets created after concatenation operation ? |
Python : I 'm trying not to use lambda here because of it 's performance issues in loops , I know there 's uses for lambda but I find this one should have a better alternative.Original code : this works but I do n't like that lambda there.I have tried the following : I must be missing something small here that will mak... | itertools.accumulate but trying to replace lambda with str.join |
Python : Say I have a list of names in python , such as the following : names = [ 'Alice ' , 'Bob ' , 'Carl ' , 'Dave ' , 'Bob ' , 'Earl ' , 'Carl ' , 'Frank ' , 'Carl ' ] Now , I want to get rid of the fact that there are duplicate names in this list , but I do n't want to remove them . Instead , for each name that ap... | Labeling duplicates in a list |
Python : As per the official python tutorial , In interactive mode , the last printed expression is assigned to the variable _ . This means that when you are using Python as a desk calculator , it is somewhat easier to continue calculations , for example : This variable should be treated as read-only by the user . Don ... | Is it acceptable to use underscore as a loop variable in python ? |
Python : For some reasons python gets variable from global namespace when situations like this occurs : Please look at this code : In accordance with PEP 227 A class definition is an executable statement that may contain uses and definitions of names . These references follow the normal rules for name resolution . The ... | Variable scopes inside class definitions are confusing |
Python : I have the below data.. where you can see spaces between 2 lines in the beginning and no spaces in between some other lines : I need the final output as this : I have tried using output = `` `` .join ( line.strip ( ) for line in f ) but it doesnt work as I need . this is my output : all the lines in a single l... | joining only lines with spaces in python |
Python : I have two lists in python , which stores some class instances in different manners ( e.g . order ) . Now , I would like to create a copy of these two lists for some purpose ( independent from the existing ones ) . To illustrate my problem clearly , I created a demo code below.By using deepcopy operation , I c... | Deepcopy of two lists |
Python : Let 's say I want a custom frozenset with 2 elements , that iterates , hashes , compares , and has various other nice operations as a frozenset , but prints differently . I can inherit , or I can delegate , but in neither case I get what I want.If I inherit literally , there seems to be no way I can write __in... | Customizing immutable types in Python |
Python : I have three strings which have information of the street name and apartment number . `` 32 Syndicate street '' , `` Street 45 No 100 '' and `` 15 , Tom and Jerry Street '' Here , I am trying to use Python 's regex to get the street names and apartment numbers separately.This is my current code , which is havi... | Python regex compile and search strings with numbers and words |
Python : I want to convert a pandas Series of strings of list of numbers into a numpy array . What I have is something like : My desired output : What I have done so far is to convert the pandas Series to a Series of a list of numbers as : but I do n't know how to go from ds1 to arr . <code> ds = pd.Series ( [ ' [ 1 -2... | Convert a pandas Series of lists into a numpy array |
Python : Take the following toy DataFrame : I 'd like to replace the `` year '' columns ( 2014-2017 ) with two fields : the most recent non-null observation , and the corresponding year of that observation . Assume field1 is a unique key . ( I 'm not looking to do any groupby ops , just 1 row per record . ) I.e . : I '... | Getting most recent observation & date from several columns |
Python : When you start your Python interpreter it appears that some modules/packages are automatically imported during the startup process : However , these modules seem to have been loaded into a different scope/namespace because you ca n't access them without an additional import : Here are my questions : What preci... | Why ca n't you reference modules that appear to be automatically loaded by the interpreter without an additional ` import ` statement ? |
Python : How would you compare two ( or more columns ) values ONLY if another column value is True.Ideally , the output would just be True ( if everything is matching correctly ) False otherwise.Something like that : df [ 'value1 ' ] .equals ( df [ 'value2 ' ] ) but only if df [ 'isValid ' ] is true.Sorry if this is a ... | Compare two or more columns values only if another column value is True |
Python : I have a data frame similar to the followingI want to create a data frame using this so that the resulting table shows the count of each category in class per yer.What 's the easiest way to do this ? <code> + -- -- -- -- -- -- -- -- + -- -- -- -+| class | year |+ -- -- -- -- -- -- -- -- + -- -- -- -+| [ ' A ' ... | Pandas groupby for multiple values in a column |
Python : Why does the example below only work if the useless _ variable is created ? The _ variable is assigned and never used . I would assume a good compiler would optimize and not even create it , instead it does make a difference.If I remove _ = and leave just Test ( ) , then the window is created , but it flickers... | Why do I need to keep a variable pointing to my QWidget ? |
Python : I 'm trying to show difference between bars using annotation . Specifically , showing difference between all bars with respect to the first bar.My code is shown below : The result graph looks like : As you can see , I 'm trying to use annotation to indicate the difference between a and b . But I do n't know ho... | How to annotate difference between bars ? |
Python : How to filter the rows in a data frame based on another column value ? I have a data frame which is , Based on the column values of `` min_subject '' and `` min_marks '' , the row should be filtered . For index 0 , the `` min_subjects '' is `` 2 '' , at least 2 elements in `` marks '' column should be greater ... | Pandas : filter the rows based on a column containing lists |
Python : Current StatusI have an abstract base class that , which hosts data in the form of a numpy array , knows how to work this data , and which can explain matplotlib how to draw it . To accomodate different types of data , it has a number of subclasses , like this : The Issuenow , the issue is how to get the class... | Calling class method as part of initialization |
Python : I 'm trying to parse output from OS X 's mdls command . For some keys , the value is a list of values . I need to capture these key , value pairs correctly . All lists of values start with a ( and then end with a ) . I need to be able to iterate over all the key , value pairs so that I can properly parse multi... | Efficiently replace multi-line list strings with single_line list string |
Python : I have a dictionary ( multidimensional ? ) like this : I would like to find any duplicate matching position ( 0 ) or ( 1 ) value in the dictionary lists and if there is a duplicate then reverse the second matching pair of numbers.The dictionary would become : Only position ( 0 ) would be a duplicate of positio... | How to reverse duplicate value in multidimensional array |
Python : I noticed that passing Python objects to native code with ctypes can break mutability expectations.For example , if I have a C function like : and I call it like this : The value of s changed , and is now b '' Xsdf '' .The Python docs say `` You should be careful , however , not to pass them to functions expec... | Python ctypes and mutability |
Python : Df1 : Df2 : Required : I have these df1 and df2 and I want to get the required df where common Ids present in Df1 and Df2 will get updated , and new Ids will get appended.I dont seem to find if I need to use update , merge or join or something else . <code> Id val1 43 79 24 5 Id val1 57 2 Id val1 53 79 24 57 2 | Update dataframe based on index and append the new ones |
Python : My code looks something like this : My question is whether LARGE_MODEL will be pickled/unpickled with each iteration of the loop . And if so , how can I make sure each worker caches it instead ( if that 's possible ) ? <code> from joblib import Parallel , delayed # prediction model - 10s of megabytes on diskLA... | How does joblib.Parallel deal with global variables ? |
Python : I have three datasets ( final_NN , ppt_code , herd_id ) , and I wish to add a new column called MapValue in final_NN dataframe , and the value to be added can be retrieved from the other two dataframes , the rule is in the bottom after codes.final_NN : ppt_code : herd_id : Expected output : The rules is : if n... | A better way to map data in multiple datasets , with multiple data mapping rules |
Python : Let 's say I have a function : I can create a higher-order function that behaves like so : And then augment ( f ) ( 1 ) will return { `` x '' : 1 , `` metadata '' : `` test '' } .But what if f is an async coroutine , this augment function does not work ( RuntimeWarning : coroutine ' f ' was never awaited and T... | Higher-order function on async coroutine |
Python : What 's the deal ? Yes , b.dtype == 'float64 ' , but so are its slices b [ 0 ] & b [ 1 ] , and a remains 'float32'.Note : I 'm asking why this occurs , not how to circumvent it , which I know ( e.g . cast both to 'float64 ' ) . <code> import numpy as npa = np.array ( [ .4 ] , dtype='float32 ' ) b = np.array ( ... | Different slices give different inequalities for same elements |
Python : I want to download all the python packages mentioned in the requirement.txt to a folder in Linux . I do n't want to install them . I just need to download them.python version is 3.6list of packages in the requirement.txt <code> aiodns==0.3.2aiohttp==1.1.5amqp==1.4.7anyjson==0.3.3astroid==1.3.2asyncio==3.4.3asy... | how to download all the python packages mentioned in the requirement.txt to a folder in linux ? |
Python : My path : I want this to be converted into : How to do this ? <code> '/home//user////document/test.jpg ' '/home/user/document/test.jpg ' | How to replace multiple forward slashes in a directory by a single slash ? |
Python : Somehow after doing this suddenly id ( list2 ) ==id ( list1 ) evaluated to True ? What on earth is happening ? while the loop is running this does not seem to bee the case the first output is as expected :0 10 , 1 11 , 2 12 , ... 0 0 , 1 2 , 2 3 , ... the second though gives:0 0 , 1 1 , 2 2 ... How is this pos... | very wonderous loop behavior : lists changes identity . What is happening ? |
Python : I am not sure how to do this but I believe is doable . I have three dataframes having the same column definition but dataset from different years . I then want to pairplot the numeric columns taking the columns one-by-one and plotting the data from these dfs appropriately labeling the set for which data comes ... | pairplot columns from multiple dataframes labelled by classes from the category column |
Python : I 'm working on the following dataframe : and discovered this Relaxed Functional Dependency ( RFD ) : meaning that for each couple of rows having a difference < =2 on the weight they would have a difference < =1 on the height too.I need to find all the subsets of rows on which this RFD holds , and show the one... | how to get dataframe subsets having similar values on some columns ? |
Python : My lecturer has set several questions on python , and this one has got me confused , I dont understand what is happening.Python tells me , after running this that x is [ [ ... ] ] , what does the ... mean ? I get even more confused when the result of the following is just [ [ ] ] If y is calculated to be [ [ ]... | Why does Python extend output [ [ ... ] ] |
Python : I am very new to Python , trying to learn the basics . Have a doubt about the list.Have a list : The output should be : The code that works for me is the followingIt gives the output [ [ 2,4,6 ] , [ 8,10,12 ] , [ 6,8,12 ] ] .Now I want the same output with a different code : With the above code the output obta... | How to modify the elements in a list within list |
Python : Consider the following function , whose output is supposed to be the cartesian product of a sequence of iterables : Works fine when generator comprehensions are replaced with list comprehensions . Also works when there are only 2 iterables . But when I tryI get Why this and not the cartesian product ? <code> d... | Why doesnt my cartesian product function work ? |
Python : I have a .txt file that looks like the s string . The s string is conformed by word_1 followed by word_2 an id and a number : I would like to create a regex that catch in a list all the ocurrences of the word `` nunca '' followed by the id VM_ _ _ _ . The constrait to extract the `` nunca '' and VM_ _ _ _ patt... | How to fix a regex that attemps to catch some word and id ? |
Python : I have a dataframe which looks like thisI want to calculate the weighted mean by group in column ' B ' ignoring the min and max value ( column ' V ' ) wherecolumn W = weightcolumn V = valueTo calculate the simple mean for each group considering all values I can do this : However , I want to ignore the max and ... | How to ignore min & max value in group when calculating weighted mean by group in Pandas |
Python : I import an image from file and that file always updates ( always save the new picture in the same file name ) and now when that image change in file My GUI not update must change page or do something that image will change I mean change on display . But I would like image change on display in real-time ( chan... | How to update image file realtime Pygame ? |
Python : This is an old-style class : This is a new-style class : This is also a new-style class : Is there any difference whatsoever between NewStyle and NewStyle2 ? I have the impression that the only effect of inheriting from object is actually to define the type metaclass , but I can not find any confirmation of th... | Is subclassing from object the same as defining type as metaclass ? |
Python : I am trying to call a function in an if , save the value in a variable and check if the value is equal to something.Have tried : I am getting a syntax error . Can this be done ? I 'm coming from C and I know that this can work : Is this possible in python ? P.S . The functions are simple so it is easier to und... | Defining variable in if |
Python : I have a dataframe as follows : What I want to do here is to create two new columns 'min ' and 'max ' , such that 'min ' outputs the last possible slot with time < last ; and 'max ' outputs the last possible slot with time < next.The desired output here should be : I tried something along the lines ofbut got a... | Finding last possible index value to satisfy filtering requirements |
Python : I have an array of strings : I want to obtain : I tried : Does n't work because I need s. in front and , at the end <code> data = [ ' a ' , ' b ' , ' c ' , 'd ' ] s.a , s.b , s.c , s.d `` s. , `` .join ( fields ) | String concatenation from a list of string , using a praticle in front and one at the end for each element |
Python : I have a dataframe as given belowHow to combine two columns in above df into a single list such that first row elements come first and then second row . My expected outputMy code : This did not work ? <code> df = index data1 data20 20 1201 30 4562 40 34 my_list = [ 20,120,30,456,40,34 ] list1 = df [ 'data1 ' ]... | Python how to combine two columns of a dataframe into a single list ? |
Python : My code : First , I click Connect button . It 's worked , but when I click Turn left or Turn right , I got an error : <code> class Receiver ( QWidget ) : def __init__ ( self ) : self.s = socket.socket ( socket.AF_INET , socket.SOCK_STREAM ) # Create button QToolTip.setFont ( QFont ( 'Time New Roman',10 ) ) sup... | Bad file descriptor when using Pyside |
Python : I was going through the code for six.py in the django utils , which , for non Jython implementations , tries , to find the MAXSIZE for the int . Now , the way this is done is interesting - instead of catching an exception on the statement itself , the statement is wrapped within a __len__ method in a custom cl... | Why does six.py use custom class for finding MAXSIZE ? |
Python : Imagine this is a part of a large text : stuff ( word1/Word2/w0rd3 ) stuff , stuff ( word4/word5 ) stuff/stuff ( word6 ) stuff ( word7/word8/word9 ) stuff / stuff , ( w0rd10/word11 ) stuff stuff ( word12 ) stuff ( Word13/w0rd14/word15 ) stuff-stuff stuff ( word16/word17 ) .I want the words . The result must ma... | Regex to match all words inside parenthesis |
Python : I 'm trying to merge two series with mismatching indicies into one , and I 'm wondering what best practices are . I tried combine_first but I 'm getting an issue where combining a series [ 0 , 24 , ... ] with a series [ 1 , 25 , ... ] should give a series with indicies [ 0 , 1 , 24 , 25 , ... ] but instead I '... | Combining two series into one with mismatching indicies |
Python : I am trying to create a class called PolyExt which is an extension of the Poly class in SymPy . And , it has its own __init__ method . But the problem is that when it passes through the __new__ method in the inherited Poly class , the extra arguments that I added to the __init__ method get interpreted as part ... | How to add arguments to a class that extends ` Poly ` class in sympy ? |
Python : I have a dict which goes something like this : I need to find which of the items in the value sets have maximum number of keys against them and also have the items listed in descending order . The output will be something like : But I read somewhere that the dict can not be in a sorted fashion , so the output ... | Identifying the values which have the maximum number of keys |
Python : My first day in Python and get confused with a very short example . Hope anyone can provide some explanation about why there is some difference between these several versions . Please ! V1 : the output is 1 , 1 , 2 , 3 , 5 , 8V2 : the output is 1 , 2 , 4 , 8 <code> a , b = 0 , 1while b < 10 : print ( b ) a , b... | Python multiple variable assignment confusion |
Python : I 'm learning about decorators and came across an example where the decorator took an argument . This was a little confusing for me though , because I learned that ( note : the examples from this question are mostly from this article ) : was equivalent to So , it does n't make sense to me how something could t... | What is the equivalent of decorators with arguments without the syntactical-sugar ? |
Python : I want to find the highest 3 values of each column in a dataframe , and return the index names , ordered by value . The dataframe looks like this : The result would look like this : <code> df = pd.DataFrame ( { `` u1 '' : [ 1,2 , -3,4,5 ] , `` u2 '' : [ 8 , -4,5,6,7 ] , `` u3 '' : [ np.NaN , np.NaN , np.NaN , ... | Finding highest n values of every column in dataframe |
Python : My string contains text = `` a ) Baghdad , Iraq b ) United Arab Emirates ( possibly ) '' I want to split this in list like [ `` Baghdad , Iraq '' , '' United Arab Emirates ( possibly ) '' ] The code which i have used is not providing me the desired resultPlease help me regarding this <code> re.split ( '\\s* ( ... | Split string into list contains alphabetical bullet list |
Python : Consider the following example : Output : I would expected the same output if enumerate is called outside the list comprehension and the iterators are assigned to variables : But I get : What is going on ? I use Python 3.6.9 . <code> s = 'abc ' [ ( c1 , c2 ) for j , c2 in enumerate ( s ) for i , c1 in enumerat... | Multiple iterators ( using enumerate ) for the same iterable , what is going on ? |
Python : Found the following code in a book but could n't get the complete explanation.The python code in the first case is creating an array of 1000000 lengths while in the 2nd part is creating a single size array and multiplying the size by the same factor.The code in the 2nd case is 100 times faster than the first c... | Why is it more efficient to create a small array , and then expand it , rather than to create an array entirely from a large list ? |
Python : If I do something like this : There is no error , I just replaced the get method.But if I do a : I get : This is strange because the source code is readable at /usr/lib/python3.6/datetime.py.I guess this library has been compiled for performance reason , that is why it can not be modified . But , then , the qu... | How to check if a function/method/class is built-in Python ? |
Python : I have a table of data with a multi-index . The first level of the multi-index is a name corresponding to a given sequence ( DNA ) , the second level of the multi-index corresponds to a specific type of sequence variant wt , m1 , m2 , m3 in the example below . Not all given wt sequences will have all types of ... | Filter a pandas data frame by requiring presence of multiple items in a MultiIndex level |
Python : I am able to select columns of a Pandas DataFrame with their positions : With this , I can select the columns b up to d.Is there any easy way I can do this using the column names ? Something like : <code> df = pd.DataFrame ( { `` a '' : [ 1 , 2 , 3 ] , `` b '' : [ 4 , 5 , 6 ] , `` c '' : [ 7 , 8 , 9 ] , `` d '... | Python Pandas : Selection of Columns by Column Names |
Python : I got this : So in this case Why is <code> # slicing : [ start : end : step ] s = ' I am not the Messiah ' # s [ 0 : :-1 ] = ' I ' start=0 , end=0 , step=-1 s [ 0 : :-1 ] == ' I ' > > > > True | Why is that slicing expression generating that output |
Python : So I was trying to make something that resembles fireworks . I made a particle class , which will make up the fireworks.Then I made a Fireworks class which shoots particles from 0 to 360 degrees.Now I want to draw a line from the position they spawn ( 600 , 300 ) , along the path the particles take . But the t... | Drawing a line between points in pygame |
Python : If I have a list as such : How would you get that in a single string that states Is there a simpler way than <code> arr = [ [ `` Hi `` , `` My `` , `` Name `` ] , [ `` Is `` , `` Sally . `` , `` Born `` ] , [ 3 , 13 , 2010 ] ] H , My Name Is Sally . Born 3 13 2010 example = `` '' for x in range ( len ( arr ) )... | How to append list of numerous types to single string ( python ) |
Python : Given a class or function , is there a way to find the full path of the module where it is originally defined ? ( I.e . using def xxx or class xxx . ) I 'm aware that there is sys.modules [ func.__module__ ] . However , if func is imported in a package 's __init__.py , then sys.modules will simply redirect to ... | Getting a function 's module of original definition |
Python : I would have hoped this works ( in Python 3.6 ) , but I get Surprisingly , works as hoped . <code> class A : __hash__ = idA ( ) .__hash__ ( ) TypeError : id ( ) takes exactly one argument ( 0 given ) def my_id ( self ) : return id ( self ) class A : __hash__ = my_idA ( ) .__hash__ ( ) | Why can I not assign ` cls.__hash__ = id ` ? |
Python : Python supports creating properties `` on the fly '' , like so.But this is a tad ugly . I have to have some instruction within the class , either a function or a class property definition.But the main hindrance is this ... And it raises because first does n't exist , obviously . I would have to do something li... | How can I recursively create class properties in Python ? |
Python : Consider this statement : However : It is incredible . What 's the reason and the interpretation ? <code> > False == False in [ False ] True > ( False == False ) in [ False ] False > False == ( False in [ False ] ) False | How can an expression be different from however paarenthesized ? |
Python : I want to map a list or array into an array in python 3.x , input a [ a , b , c ] and get result like [ a*2 , a*2+1 , b*2 , b*2+1 , c*2 , c*2+1 ] e.g : There must be better ways . Both list and numpy solutions will be ok . Thanks <code> a = np.array ( [ 2,4,6 ] ) result = [ ] for a1 , a2 in zip ( a*2 , a*2+1 )... | Map python array into a x times longer array using each element x times |
Python : I have a large dataframe containing a column titled `` Comment '' within the comment section I need to pull out 3 values and place into separate columns i.e . ( Duty cycle , gas , and pressure ) `` Data collection START for Duty Cycle : 0 , Gas : Vacuum Pressure : 0.000028 Torr '' Currently i am using .split a... | How to select values in between strings and place in column of dataframe using regex in python |
Python : Is there any good reason why one would assign a class to a variable as shown in the code below ? What are some useful/interesting things one can do thanks to that mechanic ? <code> class foo : # Some initialization stuff def __init__ ( self ) : self.x = 0 # Some methods and other stuffmyVar = foo | Uses of assigning a class to a variable in Python |
Python : I am brand-new to web scraping and want to scrape the player name and salary from spotrac for a university project.What I have done to date is as below.The output of this is only 100 names , but the page has 1000 elements . Is there a reason why this is the case ? <code> import requestsfrom bs4 import Beautifu... | Beautifulsoup only returing 100 elements |
Python : I want to remove the few words in a column and I have written below code which is working fine Now I have around 30 words to remove but I ca n't repeat this line of code 30 times Is there any way to solve my issue if yes please guide me <code> finaldata [ 'keyword ' ] = finaldata [ 'keyword ' ] .str.replace ( ... | Removing multiple phrases from string column efficiently |
Python : I have a dataframe that have two values : What I am trying to do is to remove the numeric digits in case of the split ( ' _ ' ) only have numeric digits.The desired output is : For that I am using the following code : But it gives me the following output : How can do what I want ? Thanks ! <code> df = pd.DataF... | Python - Pandas - Remove only splits that only numeric but maintain if it have alphabetic |
Python : I wish to add a new row in the first line within each group , my raw dataframe is : it is like this : For each person ( 'ID ' ) , I wish to create a new duplicate row on the first row within each group ( 'ID ' ) , the values for the created row in column'ID ' , 'From_num ' and 'To_num ' should be the same as t... | How to add a row to every group with pandas groupby ? |
Python : Given a Pandas dataframe df , we can sum the columns like thisand produce the sum of sums like this.Can this be done using only dataframe operations , without resorting to Python 's sum ( ) ? <code> [ x for x in df.sum ( ) ] sum ( [ x for x in df.sum ( ) ] ) | Pandas : Summing all elements in a dataframe ? |
Python : If I do import A from within a directory containing both A.py and A.so , the .so file will be imported . I 'm interested in changing the order of import file types , so that .py takes precedence over .so , though only temporarily , i.e . between code line i and j . Surely this can be achieved through some impo... | Python : Changing precedence of import file types ( .py before .so ) |
Python : I was curious about how something worked in yum so I was looking at some of its score code and I found this line in the erasePkgs function in cli.py.The if False : pass does nothing correct ? It never gets into that branch it always just skips to the next one does n't it ? Here is the link to the source code :... | Useless if statement in yum source |
Python : Using list comprehension I have created a list of tuples which looks likeI could also create a list of lists if that works easier.Either way , I would now like to get an array , or a 2D list , from the data . Something where I can easily access the value of the first element in each tuple in the above using sl... | Converting a list of tuples to an array or other structure that allows easy slicing |
Python : I searched all over and could not come up with a reasonable search query to produce helpful results . I 'll try to explain this with a simple example ( that is tested ) .Suppose I have some small custom Python library that contains just the following private class and public instance of it : Now , I also have ... | Accessing a class instance in a library from two separate scripts in a project |
Python : I 'm confused by the behaviour of type conversion when constructing a structured/recarray : This simple example takes in numerical fields but defines the type as string : Which produces : So the values were converted to empty strings which is not what you would expect from : Which produces the string ' 1.0 ' .... | python structured/recarray type conversion behaviour |
Python : I have a pypi package called collectiondbf which connects to an API with a user entered API key . It is used in a directory to download files like so : I know this should be basic knowledge , but I 'm really stuck on the question : How can I save the keys users give me in a meaningful way so that they do not h... | How to have persistent storage for a PYPI package |
Python : I have a matrix x with 3 x 3 dimensions and a vector w that is 3 , :I need to generate another vector y that is a majority vote for each row of x . Each column of x is weighted by the corresponding value in w. Something like this : for y [ 0 ] , it should look for X [ 0 ] = > [ 1 , 2 , 1 ] columns with value 1... | Return majority weighted vote from array based in columns |
Python : My problem looks something like this.Then I call on the fields from another module . The class is initiated before and I call on the name field like this : Which gives : I do n't understand why it would be different values . Does anyone have any idea why this would happen ? Thanks for your time . <code> # Modu... | Accessing field : different value if its stored in a dict |
Python : I 'm trying to set a default value for an argument in a function I 've defined . I also want another argument to have a default value dependent on the other argument . In my example , I 'm trying to plot the quantum mechanical wavefunction for Hydrogen , but you do n't need to know the physics to help me.where... | Setting argument defaults from arguments in python |
Python : I have a sample DF , trying to replace the list of column values with ascending sorted index : DF : Step 1 : Step 2 : In this group , replace the values of columns [ `` d1 '' , '' d2 '' ] with index ( not the DF index ) of sorted mean values based on c.For example in the above group mean ( c , d1= '' Apple '' ... | Replace pandas column with sorted index |
Python : I am trying to make a recursive merge sort function in python , however , my code would not work . It first splits the code into 1 cell arrays then merges and sorts them together . However , on the second level of the merge , the function reverts back to the arrays that have not been sorted . I was wondering h... | How to fix my merge sort because it reverts my arrays into unsorted ones ? |
Python : What 's the approved programming pattern for distributing keyword arguments among called functions ? Consider this contrived ( and buggy ) example : Obviously the set_size ( ) method will object to receiving material or color keyword arguments , just as set_appearance ( ) will object to receiving width , heigh... | best way to distribute keyword arguments ? |
Python : I would like to know how Python 3 ( not 2 , please : P ) address the following situation : I have a class and two instances : Do a.something and b.something share the same memory address , or each one have a something declared ? How the resolution of calling a.something works ? When I try to see the methods id... | Does different instances share the same methods declared in the class ? |
Python : I have an input text which looks like this : I have to renumber word and bla from 1 , in each line.I can renumber the whole input which looks like this : The code for the above : Ideally , the result should look like this : <code> word77 text text bla66 word78 text bla67text bla68 word79 text bla69 word80 text... | Renumbering line by line |
Python : Today I have started to learn Python . The first things I learned were values , expressions and ( arithmetic ) operators . So far , everything makes sense , except one thing that I don not get : Whileevaluates to 4 ( which makes sense ) , results in a SyntaxError ( which also makes sense ) . But what – from my... | Why can I repeat the + in Python arbitrarily in a calculation ? |
Python : I 'm playing around with generators to better understand how they work , but I 'm confused with the result of the following piece of code : What 's going on here ? Looks like as it hits the `` for i in count : '' line the generator yields the first value . I 'm not sure . EDIT : I should add that I 'm not tryi... | Python Generator : confusing result |
Python : I have a datframe as : For RES1 , I want to create a counter variable RES where COND ==1 . The value of RES for the first KEY of the group remains same as the VAL ( Can I use cumcount ( ) in some way ) . For RES2 , then I just want to fill the missing values asthe previous value . ( df.fillna ( method='ffill '... | How to create a increment var from a first value of a dataframe group ? |
Python : I have a question about generators and/or python 's execution model.Given something like : My main confusion is : What happens to handle ifis called only once ? Does the handle stay open for the life of the program ? What if we have scarce resources being allocated in a generator body ? Threads ? Database hand... | Lifespan of open handles in a python generator body |
Python : I have two dataframes where one contains pet ID 's and names , and the other user 's and a list of the ID 's of the pets they like . I 'd like to get this into a dict where the keys are users , and the values being all the names of the pets they like . <code> id name0 4 Bert1 5 Ernie2 6 Jeff3 7 Bob4 8 Puppy5 9... | Most efficient way to rename elements in dataframe of lists |
Python : So , I wanted to try GCloud since you can deploy serverless stuff pretty easily . I 've made a simple Flask app to test it out , this is the entire code for the app : Here is the Dockerfile : I 've also tried using gunicorn and waitress to start the server , the same thing happens.Commands I run to deploy to g... | Cloud builds failing for super simple Flask app no matter what I do |
Python : I often have statements in my code that do the following : which is very clear , but verbose and somewhat redundant at the same time . Is there any way in Python to simplify this statement perhaps by making some_function act as a `` mutating '' ( `` in-place '' ) function ? For example , in Julia one can often... | Mutating / in-place function invokation or adaptation in Python |
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