text stringlengths 46 37.3k | title stringlengths 12 162 |
|---|---|
Python : I want to extract year from my Data Frame column data3 [ 'CopyRight ' ] .I am using the below code to extract the year : with my Code I am only getting the First occurrence of year.I want to extract all the years mentioned in the column.Expected Output <code> CopyRight2015 Sony Music Entertainment2015 Ultra Re... | extracting dates using Regex in python |
Python : I 've got a txt file of all the countries in the world and what kind of products do they export.This is what one line looks like without any splitting or stripping ( notice \t and \n ) : [ Jamaica\t alumina , bauxite , sugar , rum , coffee , yams , beverages , chemicals , wearing apparel , mineral fuels\n ] I ... | How do I print something and then its list ? |
Python : Just starting learning python 3 weeks ago and so far , I was mostly able to understand the information given in class . Now I 'm really having trouble with this previous assignment for the past week now . While spending countless hours every day searching , reading , indexing the docs , GitHub , and other sour... | How to plot a path from a set of instruction from a long string |
Python : In this exercise I need to come up with a way to find the least common multiple ( LCM ) for the first 20 natural numbers ( 1-20 ) .So far this is what I got : Is there a more efficient , to code this without the need to write a condition for every potential number to be factored in the loop ? <code> if exercis... | How can I reduce the number of conditions in a statement ? |
Python : resultnestedList1 : [ [ [ 'bb1 ' ] , [ [ 'aa3 ' ] , 'aa1 ' , 'aa2 ' ] , 'aa ' , 'bb ' ] , 'root ' ] nestedList2 : [ [ [ 'cc1 ' ] , [ [ [ 'bb4 ' ] , 'bb2 ' , 'bb3 ' ] , 'bb1 ' ] , [ [ 'aa3 ' ] , 'aa1 ' , 'aa2 ' ] , 'aa ' , 'bb ' , 'cc ' ] , 'root ' ] All I want is the results below.resultnestedList1 : [ [ [ [ '... | How do I get such a nested lists ? |
Python : So , I created an vertical numpy array , used the /= operator and the output seems to be incorrect . Basically if x is a vector , s a scalar . I would expect x /= s have every entry of x divided by s. However , I could n't make much sense of the output . The operator is only applied on part of the entries in x... | numpy : unexpected result when dividing a vertical array by one of its own elements |
Python : All comparison operations in Python have the same priority , which is lower than that of any arithmetic , shifting or bitwise operation . Thus `` == '' and `` < `` have the same priority , why would the first expression in the following evaluate to True , different from the 2nd expression ? I would expect both... | Python comparison operator precedence |
Python : I have two numpy arrays a , b of the same shape , b has a few zeros . I would like to set an output array to a / b where b is not zero , and a otherwise . The following works , but yields a warning because a / b is computed everywhere first.Filtering the division with a mask does n't perserve the shape , so th... | avoid division by zero in numpy.where ( ) |
Python : Is there any stylistic taboo or other downside to implementing trivial methods by assignment to class attributes ? E.g . like bar and baz below , as opposed to the more ususal foo.I find myself tempted by the apparent economy of things like this : <code> class MyClass ( object ) : def hello ( self ) : return '... | Can/should I implement Python methods by assignment to attributes ? |
Python : I have the following code ( based on http : //strftime.org/ ) : The above prints : However bash recognizes this date format : What am I missing ? It seems that the % -I is the problem , since Python matches date without the % -I section : output : I 'm on python 2.6.6.The actual pattern I need to match uses 12... | Datetime pattern does not match in python even though bash recognizes it |
Python : I have this multidimensional array : I want to substract all of them with 1 . So the result will be : <code> n = [ [ 1 ] , [ 2 ] , [ 3 ] , [ 4 ] , [ 5 ] , [ 6 ] , [ 7 , 10 ] , [ 8 ] , [ 9 ] , [ 7 , 10 ] ] result = [ [ 0 ] , [ 1 ] , [ 2 ] , [ 3 ] , [ 4 ] , [ 5 ] , [ 6 , 9 ] , [ 7 ] , [ 8 ] , [ 6 , 9 ] ] | How to substract multidimensional array in Python ? |
Python : This code in Python 2.7 creates a closure around func , enclosing the par variable : It can by used like so : At runtime , is there a way to get name of the function in which the closure was defined ? That is : having only access to the f variable , can I get information that f closure was defined inside creat... | How can I determine the function in which a closure was created ? |
Python : I would like to replace a value in my Pandas dataframe in Python . ( replace float with string ) . I know the value itself , but not the column nor the row and want to run it afterwards with different inputs.I have the following dataframe : now I want to replace values larger than 110 with 'OVER ' and smaller ... | Replace certain value in pandas Dataframe without knowing neither column nor row |
Python : I am performing topic detection with supervised learning . However , my matrices are very huge in size ( 202180 x 15000 ) and I am unable to fit them into the models I want . Most of the matrix consists of zeros . Only logistic regression works . Is there a way in which I can continue working with the same mat... | How can I handle huge matrices ? |
Python : I have some python files in a directory called 'circular_dependency ' : import_file_1.py : import_file_2.py : and finally main.pyrunning main.py results in the following error : As far as I have understood , python does not really cope well with circular ( well , actually those are non-harmful ) `` circular ''... | python circular dependency issue : unexpected error |
Python : I have a np.arrray like this : And a function to compute the distance between two rows : I need all pairwise distances , and I do n't want to use a loop . How do I do that ? <code> [ [ 1.3 , 2.7 , 0.5 , NaN , NaN ] , [ 2.0 , 8.9 , 2.5 , 5.6 , 3.5 ] , [ 0.6 , 3.4 , 9.5 , 7.4 , NaN ] ] def nan_manhattan ( X , Y ... | How can I make a distance matrix with own metric using no loop ? |
Python : I have a dictionary of DataFrames with the key referring to the year of the data . I would like to iterate through the dict and make modifications to the DataFrames . I make modifications to both the column names and the contents of the dfs.Can someone explain to me the behavior of doing this ? Particularly , ... | What is the best practice for looping through a dictionary of pandas dataframes and making modifications ? |
Python : I have a data frame that contains duplicates . and I would like to remove these duplicates . I also found this function from pandas df.drop_duplicates ( subset= [ 'Action ' , 'Name ' ] ) .Unfortunately , this function removes too much , because only if the time is less than or equal to 5 minutes should it be r... | Dataframe removes duplicate when certain values are reached |
Python : After struggling with this amazing facebookresearch/PyTorch-BigGraph project , and its impossible API , I managed to get a grip on how to run it ( thanks to stand alone simple example ) My system restrictions do not allow me to train the dense ( embedding ) representation of all edges , and I need from time to... | Use pre trained Nodes from past runs - Pytorch Biggraph |
Python : I was just messing around in the Python interpreter and I came across some unexpected behavior.Ok , so far nothing out of the ordinary ... Here 's where things start getting spooky . I figure this happens because the all function iterates over the generator expression , calling its __next__ method and using up... | Passing generator expressions to any ( ) and all ( ) |
Python : I 'm confused how the following python code works to split a string to individual characters using b [ :0 ] = a . Should n't it be just b = [ 'abc ' ] ? output : <code> a='abc ' b= [ ] b [ :0 ] =aprint ( b ) b= [ a , b , c ] | Splitting string to individual characters using slicing |
Python : I recently needed to quickly find the arcsine of 10 . I decided to use python to calculate it for me : Based on experience I had expected a result in the 4th quadrant ( positive real ( pi/2 ) and negative imaginary ) . Surprise ... it returned the 1st quadrant result . I tried numpy.arcsin as well ... same res... | Both cmath and numpy give `` incorrect '' value of asin ( 10 ) |
Python : I have a dataframe `` df1 '' : And here 's the object list : Code : After I split it , the dataframe will be like this : I want to add another column `` response_object '' , if they find the adj in response , they find its object from list object : expected resultcode : It prints ValueError <code> adj response... | find element in list in dataframe |
Python : I want to get all possible combinations of three ( or more ) numbers . The numbers themselves need to be in the range of +-1 . The range is to find 'similar numbers ' - for example the number 3 needs to be iterated as 2,3,4 . E.g I have : So in this example I want all combinations for these three numbers and e... | How can I simplifiy this python iteration ? |
Python : I have a situation where I have data that sometimes can be nested in multiple array layers.Some times the data can be nested like : Other timesI want to extract the array and return it , what would be the most pythonic way of doing this ? <code> [ [ 'green ' , 'blue ' , 'red ' ] ] [ [ [ [ 'green ' , 'blue ' , ... | Simplest way to return an array that is nested in multiple arrays |
Python : If I have an array with nan , which looks like this : how can I shift all the nans to the start of the array , without changing the shape ? Some thing like this : <code> array ( [ [ 0. , 0. , 0. , 0 . ] , [ 0. , 0. , nan , nan ] , [ 0. , 1. , 3. , nan ] , [ 0. , 2. , 4. , 7 . ] , [ 0. , nan , 2. , nan ] , [ 0.... | Shift `` nan '' to the beginning of an array in python |
Python : Given a DataFrameHow get something like this : if we consider the dataframe as an array of indices i , j then in diag n would be those where abs ( i-j ) = na plus would be to be able to choose the order : intercale = True , first_diag = 'left'intercalate = False , first_diag ='left'intercalate = True , first_d... | pivot a dataframe by diagonals |
Python : I have a list of lists like this , I want to iterate through the big_list and check each list values against the sec_list . While I check , I want to store the values that are not matching into a another list of lists . So , I did this : I get the result like this : However , I need a list of lists like this ,... | Get a list of lists , iterating a list of lists |
Python : For an introduction to Python course , I 'm looking at generating a random floating point number in Python , and I have seen a standard recommended code of for a random floating point from 5 up to but not including 10.It seems to me that the same effect could be achieved by : Since that would give an integer o... | Does this truely generate a random foating point number ? ( Python ) |
Python : Basically , return a list of 2n tuples conforming to the above specification . The above code works fine for my purposes but I 'd like to see a function that works for all n ∈ ℕ ( just for edification ) . Including tuple ( [ 0 ] *n ) in the answer is acceptable by me.I 'm using this to generate the direction o... | What is the pythonic way of generating this type of list ? ( Faces of an n-cube ) |
Python : So I am using the python chain method to combine two querysets ( lists ) in django like this.Where data and tweets are two separate lists . I now have a `` results '' list with both data and tweet objects that I want ordered in this fashion.What is the best way to achieve this kind of ordering ? I tried using ... | Python-Order a list so that X follows Y and Y follows X |
Python : I have this problem.let l be a list containing only 0 's and 1 's , find all tuples that represents the start and end of a repeating sequence of 1's.exampleanswer : [ ( 0,2 ) , ( 5,8 ) , ( 9,10 ) ] i solved the problem with the following code , but i think it is pretty messy , i would like to know if there is ... | More elegant way of find a range of repeating elements |
Python : I 'm trying to decorate all methods in class and i succeded with this code , but i 'm also trying to log calls to operators like * + - / , is there any way to decorate them or something like getattr ( self , '' * '' ) to log the calls ? <code> class Logger ( object ) : def __init__ ( self , bool ) : self.bool ... | Decorate operators python3.5 |
Python : This is mostly an exercise in learning Python . I wrote this function to test if a number is prime : Then I realized I can make easily rewrite it using any ( ) : Performance-wise , I was expecting p2 to be faster than , or at the very least as fast as , p1 because any ( ) is builtin , but for a large-ish prime... | Performance of any ( ) |
Python : My program keeps randomly skipping out letters ! For example , 'coolstory ' becomes 'yrotsloc ' and 'awesome ' becomes 'mosewa'Here is the code : EDIT : Thanks for the answers everyone . I just rediscovered this forgotten account . I can assure you 6 years later I know how to properly reverse strings in a vari... | Program for word reversal randomly skips out letters ? |
Python : I have a string ( Ex : BCVDBCVCBCBD ) which i have converted into a list using the This resulted in a list like [ ' B ' , ' C ' , ' V ' ... ... ... , 'D ' ] Now considering I take a user input , in the form of a number ( say for example 2 ) . I need to read every 2nd element from the start i.e 1st letter of se... | Grouping in a list with sequence re-read |
Python : Is there an efficient way to merge two lists of tuples in python , based on a common value . Currently , I 'm doing the following : returns : While this code works perfectly fine for small lists , it 's incredibly slow for longer lists with millions of records . Is there a more efficient way to write this ? ED... | Join lists by value |
Python : I know that if I want to get the intersection of two sets ( or frozensets ) I should use the ampersand & . Out of curiosity I tried to use the word 'and ' I am just curious why ? what does this and represent when used with lists ? <code> a = set ( [ 1,2,3 ] ) b = set ( [ 3,4,5 ] ) print ( a and b ) # prints se... | Behavior of `` and '' with sets in Python |
Python : Say I have three dictionaries a , b and c. I want to exec ( ) a code snippet where a is the globals , b is the nonlocals and c is the locals . That is no problem for the globals and locals , as I just have to use exec ( code , a , c ) -- but what about b ? How can I make the values in b visible to the code sni... | Exec Python code with nonlocals |
Python : If I have few lines which read : What is the best way to capture the numeric elements ( namely just the first instance ) and the first parentheses if it exists . My current approach is to use split the string for every ' ' . and str.isalpha to find the non alpha elements . But , not sure of how to obtain the f... | Extracting numeric data Python |
Python : I have a pandas.Series with sentences like this : on the other hand , I have a list of names and surnames like this : l = [ 'juan ' , 'antonio ' , 'esther ' , 'josefa ' , 'mariano ' , 'cristina ' , 'carlos ' ] I want to match sentences from the series to the names in the list . The real data is much much bigge... | How can i remove strings from sentences if string matches with strings in list |
Python : I found the following lines in the json/encoder.py module : In what situation is an object not equal to itself ? <code> if o ! = o : text = 'NaN ' | In what situation is an object not equal to itself ? |
Python : With the code below I tried to print a bunch of things in parallel on a jupyter-notebook using a ThreadPoolExecutor . Notice that with the function show ( ) , the output is not what you 'd normally expect.But when I try with sys.stdout.write ( ) , I do n't get this behavior.The weird thing is , I tried this bo... | end= ' ... ' key in print ( ) not thread safe ? |
Python : I 'm using Pandas to populate 6 new variables with values that are conditional to other data variables . The entire dataset consists of about 700,000 rows and 14 variables ( columns ) including my newly added ones.My first approach was to use itertuples ( ) , mainly down to experience being minimal here . This... | What is a more efficent way to populate new variables based on other variable results in Pandas |
Python : I have a long list of file paths , like : I know that I can wrap this list in a map iterator , which provides sequential access to items in list mapped through a function , like : Then I can lazily load those image files as I iterate over the list : But I want random access to the original list , mapped throug... | How can I create an indexable map ( ) , or a decorated list ( ) ? |
Python : I 'm trying to write a regular expression to sift through 3mb of text and find certain strings . Right now it works relatively well , except for one problem.The current expression I 'm using isThis effectively searches through the enormous string and finds all occurences of 4 uppercase aplha characters followe... | How can I find a string that contains any between two regular expressions except for a certain regex in python ? |
Python : A silly question , but this is bugging me ( regardless of downvotes for my imbecility ! ) : I think I have picked up a nonsensical fear of generating data outside of a method that method uses ( without changing ) , but I am unsure if this is the case.Let 's say I have a method myfx , that will need some dictio... | Pythonic way of generating data outside of a method |
Python : I have a dataframe that looks like this : How do I get it to look like : ? <code> desc item type1 date1 type2 date2 type3 date30 this foo1 A 9/1 B 9/2 C 9/31 this foo2 D 9/4 E 9/5 F 9/6 desc item type date0 this foo1 A 9/11 this foo1 B 9/22 this foo1 C 9/33 this foo2 D 9/44 this foo2 E 9/55 this foo2 F 9/6 | Expand pandas dataframe and consolidate columns |
Python : I have to create a maze game , which receives as an input a command from the user in order to play the game . I have written the code for the maze game . What I want to modify is to only show part of the maze when it is printed to the user ( after a move has been made ) . Here is the maze I have : With an outp... | Print part of a 2D list |
Python : I 'm doing a lexer as a part of a university course . One of the brain teasers ( extra assignments that do n't contribute to the scoring ) our professor gave us is how could we implement comments inside string literals.Our string literals start and end with exclamation mark . e.g . ! this is a string literal !... | How to ignore comments inside string literals |
Python : I 'm trying to find out if it 's possible to resolve variables in stack frames ( as returned by inspect.currentframe ( ) ) .In other words , I 'm looking for a functionFor an example , consider the following piece of code : Local and global variables are trivially looked up through the f_locals and f_globals a... | Resolve a variable name given only a stack frame object |
Python : I need to generate a list of triplets containing only uppercase English letters : What is the fastest way to do this in python ? <code> [ `` AAA '' , '' AAB '' , '' AAC '' , ... , 'ZZZ ' ] | Generate all base26 triplests in the fastest way |
Python : I 'm needing to create a script , that will load a csv ( sometimes tagged as .inf ) to memory , and evaluate the data for a type of duplicate . The csv itself will always have different information in every field , but the columns will be the same . Around 100~ columns . In my examples , i 'm going to narrow i... | Finding duplicates , and uniques of the duplicates in a csv |
Python : There are two tables that one column of table A is pointing another table B 's primary key.But they are placed in different database , so I can not configure them with foreign key.Configuring via relationship ( ) is unavailable , so I implemented property attribute manually.This code works well for simple oper... | How can I make property comparison able to be compiled to SQL expression in SQLAlchemy ? |
Python : I have a dictionary like this : Now I would like to check if the key 'silver ' is in the dictionary : But I receive the error : So how can I achieve that in python ? <code> a = { 'values ' : [ { 'silver ' : '10 ' } , { 'gold ' : '50 ' } ] } if 'silver ' in a [ 'values ' ] : NameError : name 'silver ' is not de... | How to check if in list in dictionary is a key ? |
Python : I read somewhere that it is bad to define functions inside of functions in python , because it makes python create a new function object very time the outer function is called . Someone basically said this : Is this true ? Also , what about a case when I have a ton of constants like this : Is it faster if I pu... | When a function is used in python , what objects need to be created ? |
Python : I have a dataframe with a multi-index : `` subject '' and `` datetime '' .Each row corresponds to a subject and a datetime , and columns of the dataframe correspond to various measurements.The range of days differ per subject and some days can be missing for a given subject ( see example ) . Moreover , a subje... | pandas : resample a multi-index dataframe |
Python : I am using pytest 's indirect parameterization to parameterize an upstream fixture . This has been working fine for me.However , now I am stuck on when the upstream fixtures have the same argument names , and I want to pass them different values.How can I use indirect parameterization when the upstream fixture... | pytest : how to use indirect parameterization when fixtures have same parameters |
Python : This is really strange to me , because by default I thought unpacking gives tuples.In my case I want to use the prefix keys for caching , so a tuple is preferred.But I thought unpacking would return a tuple instead.Here is the relevant PEP : https : //www.python.org/dev/peps/pep-3132/ -- Update -- Given the co... | Why does unpacking give a list instead of a tuple in Python ? |
Python : I have 2 files : hyp.txtref.txtAnd I have a function that does some calculations to compare the lines of the text , e.g . line 1 of hyp.txt with line 1 of ref.txt.And this function can not be changed . I can however manipulate what i feed to the function . So currently I 'm feeding the file into the function l... | How to workwith generators from file for tokenization rather than materializing a list of strings ? |
Python : novice at Python encountering a problem testing for equality . I have a list of lists , states [ ] ; each state contains x , in this specific case x=3 , Boolean values . In my program , I generate a list of Boolean values , the first three of which correspond to a state [ i ] . I loop through the list of state... | Lists are the same but not considered equal ? |
Python : I have a case for having a preliminary frontend Flask app before continuing to my main app.I 've implemented it using a `` middleware '' pattern : Is there a more idiomatic way of doing this , without creating a context just to check whether the URL is handled by the app ? I want to maintain the flexibility of... | Detecting whether a Flask app handles a URL |
Python : Suppose I have a DataFrame such as : And multiple lists such as : I can update the value of col2 depending on whether the value of col1 is included in a list , for example : However this is very slow . With a dataframe of 30,000 rows , and each list containing approx 5,000-10,000 items , it can take a long tim... | Fastest Way To Filter A Pandas Dataframe Using A List |
Python : I 'm trying to package my python code to publish in on Anaconda cloud . The folder structure looks like this : The meta.yaml file : Command I am using to build the package ( haasad is the name of the channel of the pypardiso package ) : conda build conda-recipe -c haasadThe build is successful and I have uploa... | How do I fix conda UnsatisfiableError of my custom conda package ? |
Python : I would like to analyze statistics per cars which were repairs and which are new . Data sample is : So , I should groupby by Name and if there is a False in IsItNew column I should set False and the first date , when False was happened.I tried groupby with nunique ( ) : But , it returns count of unique items i... | Group by unique Name and Status with the last Date |
Python : I just discovered in the definition of variables in Python . Namely : gives me a=1 and b=0 or a and b are two independent variables.But : gives me a = [ 0 ] and b = [ 0 ] , or a and b are two references to the same object . This is confusing to me , how are these two cases different ? Is it because int are pri... | Python : `` Chained definition '' of ints vs lists |
Python : I have an input file with containing a list of strings.I am iterating through every fourth line starting on line two.From each of these lines I make a new string from the first and last 6 characters and put this in an output file only if that new string is unique.The code I wrote to do this works , but I am wo... | Improving the speed of a python script |
Python : I 'm trying to translate this line of code from Python to MATLAB : So , naturally , I wrote something like this : But it gives me the following error when it reaches that line : Requested 106275x106275x3 ( 252.4GB ) array exceeds maximum array size preference . Creation of arrays greater than this limit may ta... | What is the equivalent way of doing this type of pythonic vectorized assignment in MATLAB ? |
Python : I was doing some experimentation about operations ' speed on list . For this I defined two list : l_short = [ ] and l_long = list ( range ( 10**7 ) ) .The idea is to compare bool ( l ) with len ( l ) ! = 0In an if contest , the following implementation is faster by a lot if l : pass instead of if len ( l ) ! =... | Why is ` len ( l ) ! = 0 ` faster than ` bool ( l ) ` in CPython ? |
Python : My table class looks pretty typical except that maybe it includes a before_render ( ) function . What 's great about before_render is that I can access self . This gives me access to dynamic information about the model I 'm using . How can I access dynamic information ( like from before_render ) to change the ... | How to change order_by dynamically using django-tables2 ? |
Python : I am studying the properties of functions in Python and I came across an exercise that asks to : Write a function which returns de power of a number . Conditions : The function may only take 1 argument and must use another function to return the value of the power of a given number.The code that solves this ex... | Function Calling With 3 or More Argument Input Fields - function ( ) ( ) ( ) |
Python : I 've been reading other posts and could n't figure it out . No matter what I enter at the end of this repeat it always repeats the loop . I 've tried while ( repeat ! = `` Quit '' or repeat ! = `` quit '' or repeat ! = `` b '' or repeat ! = `` B '' or repeat ! = `` no '' or repeat ! = `` No '' ) : but it stil... | Why does n't my while loop stop ? |
Python : I just realized that : Works ( does not raise an error and creates a new x member ) .But this : Raises : While I probably would never use this in real production code , I 'm a bit curious about what the reason is for the different behaviors.Any hints ? <code> class A ( object ) : passa = A ( ) a.x = 'whatever ... | Why ca n't I add arbitrary members to object instances ? |
Python : I want to automatically mark tests based on which fixtures they use . For instance , if a test uses a fixture named spark , I 'd like to add a marker called uses_spark so that I can automatically ignore them.I know I can use pytest_collection_modifyitems in conftest.py to add markers.How do I implement uses_sp... | How can I find what fixtures a test uses ? |
Python : I have a plane and a sine curve in it . How to rotate these two objects , please ? I mean to slowly incline the plane on the interval -0.1 to 0.4 in order to be , for instance , perpendicular to z at point 0.4 ? After longer rotation , the maximal and minimal value of the plane and sine would construct `` the ... | Make helix from two objects |
Python : Here is a minimum working example of my problem : Why is the first assignment incorrect ? Both Series seem to have the same index , so I assume it should produce the correct result.I am using pandas 0.17.0 . <code> import pandas as pdcolumns = pd.MultiIndex.from_product ( [ [ ' a ' , ' b ' , ' c ' ] , range ( ... | Pandas DataFrame contains NaNs after write operation |
Python : I saw the code from Youtube and have a question.The code below imports time twice.import timefrom time import mktimeBy importing time on third line , I think 5th line is useless.Why does he import time twice ? <code> import pandas as pdimport osimport timefrom datetime import datetimefrom time import mktime | Importing time module twice |
Python : In my input file I have many lines , I am searching only one , which meets my requirements . And that 's already done . But I need to print a line after this line which has been already found.Example of input : I am searching for line where is x inside.Result : line 1 xSo now I need to show one line after my r... | Python : How to print one more line after my result from file ? |
Python : I 'm migrating a Django site from MySQL to PostgreSQL . The quantity of data is n't huge , so I 've taken a very simple approach : I 've just used the built-in Django serialize and deserialize routines to create JSON records , and then load them in the new instance , loop over the objects , and save each one t... | Does Django provide any built-in way to update PostgreSQL autoincrement counters ? |
Python : I thought I could make my python ( 2.7.10 ) code simpler by directly accessing the index of a value passed to a generator via send , and was surprised the code ran . I then discovered an index applied to yield does n't really do anything , nor does it throw an exception : However , if I try to index yield thri... | Why can yield be indexed ? |
Python : For example the Python decimal.Decimal ( ) class has a context . You can view the current context with getcontext ( ) and set new values for precision , rounding , or enable traps.If you wanted to set a new value for the context so this is visible throughout a Django project , where would be best to do so ? e.... | Where to setup Python environment attributes for a Django project ? |
Python : I am fairly new to python and pandas , so I apologise for any future misunderstandings.I have a pandas DataFrame with hourly values , looking something like this : Now I need to calculate 24h average values for each column starting from 2014-04-01 12:00 to 2014-04-02 11:00So I want daily averages from noon to ... | How to calculate daily averages from noon to noon with pandas ? |
Python : The df looks like below : I want to create a new df with the occurence of 8 in ' B ' and the next row value of 8.New df : The df looks like below : <code> A B C1 8 232 8 223 8 454 9 455 6 126 8 107 11 128 9 67 A B C1 8 232 8 223 8 454 9 456 8 107 11 12 | How to copy the current row and the next row value in a new dataframe using python ? |
Python : I got curious and wondered if I could have the pyautogui module detect the color from every few pixels from an image and have turtle recreate them in it 's canvas using small circles . I ended up finding a way to make it work , and I liked how the images were turning out ! The only issue with my code is that i... | Python - Turtle recreating image too slow |
Python : I have a numpy vector , and a numpy array.I need to take from every row in the matrix the first N ( lets say 3 ) values that are smaller than ( or equal to ) the corresponding line in the vector . so if this is my vector : and this is my matrix : the output should be : Is there any efficient way to do that wit... | Take N first values from every row in NumPy matrix that fulfill condition |
Python : Logical operators in Python are lazy . With the following definition : calling the or operatoronly evaluates the first function call , because or recognizes that the expression evaluates toTrue , irregardless of the return value of the second function call . and does behave analogously.However , when using any... | Python : Lazy Function Evaluation in any ( ) / all ( ) |
Python : I have a dataframe with 2.7 million rows as you see below-I am trying to Hot Encode this in python below but I end up with a Memory error : How can I do this in automated batches so it doesnt give me a memory error ? <code> dfOut [ 10 ] : ClaimId ServiceSubCodeKey ClaimRowNumber SscRowNumber0 1902659 183 1 11 ... | How can I automate slicing of a dataframe into batches so as to avoid MemoryError in python |
Python : I have a large number of files for which I have to carry out calculations based on string columns . The relevant columns look like this.I have to create new columns containing the number of occurences of certain strings in each row . I do this like this : However , this is taking minutes per file , and I have ... | How to speed up pandas apply for string matching |
Python : I need to do something like this : I found here simpler version : Is there version for elif ? Something like : How should I write this ( if this exists ) ? The code above does n't look right . <code> if A function ( a ) elif B function ( b ) else function ( c ) function ( a if A else c ) function ( a if A b el... | Inline conditional between more than 2 values |
Python : Can you please help to append two multiindexed pandas dataframes ? Trying to append df_future to df_current . COMPANY and DATE are the indexes . df_currentdf_futureBased on these dfs , want to see..df_current_and_future <code> VALUECOMPANY DATE 7/27/2015 1A 7/28/2015 2 7/29/2015 3 7/30/2015 4 7/27/2015 11B 7/2... | Append two multiindexed pandas dataframes |
Python : I have a pandas dataframe that represents elevation differences between points every 10 degrees for several target Turbines . I have selected the elevation differences that follow a criteria and I have added a column that represents if they are consecutive or not ( metDegDiff = 10 represents consecutive points... | group by pandas dataframe and select maximun value within sequence |
Python : I 'm a beginner in python and using v2.7.2 here 's what i tried to execute in the command prompt The expected output was However the actual output is Why does this happen ? and How do i achieve the expected behavior ? <code> p = 2 while ( p > 0 ) : for i in range ( 10 ) : print i+1 , p p-=1 1 22 1 1 22 13 04 -... | Python : Why does this code execute ? |
Python : I was wondering if it is possible to groupby one column while counting the values of another column that fulfill a condition . Because my dataset is a bit weird , I created a similar one : Say , I want to groupby the nationality and count the number of people that do n't have any books ( books == 0 ) from that... | Groupby one column and count another column with a condition ? |
Python : I go stuck on a problem and I can not think of any efficient way to do this . The problem is the following : I got 2 lists , each with n up to 10^3.In the following example n = 3.I need to sort both lists based on the decreasing order of the following equation : v_i/w_iSo in this case I would get : After that ... | Sort 2 list linked to each other |
Python : I am having trouble understanding what 's happening behind the scenes for this simple code snippet : The code assumes the array has as its elements the integers from 1 to n.The output for the given code when the input is [ 1,3,4,2 ] is : while I was expecting it to print and return this : Why are the values ch... | Swapping Elements in Python Iteratively |
Python : In a post I posted yesterday , I accidentally found changing the __qualname__ of a function has an unexpected effect on pickle . By running more tests , I found that when pickling a function , pickle does not work in the way I thought , and changing the __qualname__ of the function has a real effect on how pic... | pickle : how does it pickle a function ? |
Python : I have a numpy array consisting of 0 's and 1 's . Each sequence of 1 's within the array stands for occurrence of one event . I want to label elements corresponding to an event with event-specific ID number ( and the rest of array elements with np.nan ) I surely can do that in a loop , but is there more `` py... | Fast , python-ish way of ranking chunks of 1 's in numpy array ? |
Python : I have a string that can vary but will always contain x= { stuffNeeded } .For example : n=1 , x= { y , z , w } , erore= { 3,4,5 } or x= { y , z , w } or erore= { 3,4,5 } , x= { y , z , w } etc.I am having a devil of a time figuring out how to get y , z , w . The closest I got to finding the answer was based of... | Return string within a string based on expression ' x= { ( . * ) } ' |
Python : I 've tried to search this a number of times but I do n't see it answered so here goes ... I often use pandas to clean up a dataframe and conform it to my needs . With this comes a lot of .loc accessing to query it and return values . Depending on what I am doing ( and column lengths ) , this can get pretty le... | Pandas .loc and PEP8 |
Python : I have a custom file containing the paths to all my images and their labels which I load in a dataframe using : MyIndex has two columns of interest ImagePath and ClassNameNext I do some train test split and encoding the output labels as : The problem I face that the data loaded in one go is too large to fit in... | Custom Datagenerator |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.