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Python : I have the following code in python ( numpy array or scipy.sparse.matrices ) , it works : But it does n't look elegant . ' a ' and ' b ' are 1-D boolean mask . ' a ' has the same length as X.shape [ 0 ] and ' b ' has the same length as X.shape [ 1 ] I tried X [ a , b ] but it does n't work.What I am trying to ... | Shorter version of this numpy array indexing |
Python : I 've created a list ( which is sorted ) : I want to extract the numbers from this list that are at least five away from each other and input them into another list . This is kind of confusing . This is an example of how I want the output : As you can see , none of the numbers are within 5 of each other.I 've ... | extracting numbers from list |
Python : I am reading a snippet of Python code and there is one thing I ca n't understand . a is a list , num is an integerworks but wo n't work . Can anyone explain this to me ? <code> a += num , a += num | What 's the difference between a += number and a += number , ( with a trailing comma ) when a is a list ? |
Python : I had been using [ 0-9 ] { 9,12 } all along to signify that the numeric string has a length of 9 or 12 characters . However I now realized that it will match input strings of length 10 or 11 as well . So I came out with the naive : Is there a more succinct regex to represent this ? <code> ( [ 0-9 ] { 9 } | [ 0... | Is the better way to match two different repetitions of the same character class in a regex ? |
Python : Summary Question : Why does Heroku indicate os.system ( 'say ... ' ) is `` not found '' and how can I fix it ? I have a Node.js app where I am using child_process to spawn a Python script that reads out audio when it 's given a specific word . I know that it works when I run my server on localhost:5000 , but w... | Spawning python script in nodejs on heroku |
Python : I want to return a list with the interleaved elements of two lists directly from the list comprehension - without use a next step to flaten the result . Is it possible ? Return [ [ 1 , 3 ] , [ 4 , 7 ] , [ 2 , 4 ] ] But how can I get directly from the list-comprehension [ 1 , 3 , 4 , 7 , 2 , 4 ] ? <code> alist1... | Get a list ( without nested list ) directly from a list comprehension |
Python : my .py file isand xml file isi got this LINE 1 : ... partner '' . `` picking_warn_msg '' as `` picking_warn_msg '' , '' res_partn ... as error message and i ca n't move forward with my project 'odoo ' is not running at all <code> class Suppiler ( models.Model ) : _inherit = `` res.partner '' author= fields.Boo... | I got this `` LINE 1 : ... partner '' . `` picking_warn_msg '' as `` picking_warn_msg '' , '' res_partn ... '' error while inherit res.partner |
Python : Two DataFrames have matching values stored in their corresponding 'names ' and 'flights ' columns.While the first DataFrame stores the distances the other stores the dates : distancesDF : datesDF : I would like to merge them into single Dataframe in a such a way that the matching entities are synced with the c... | How to merge two DataFrames into single matching the column values |
Python : I have some Python classes that , if simplified , look like : The base class contains methods ( represented above by doThings and doMoreThings ) which implement functionality common to both the foo and bar subclasses . The foo and bar subclasses differ essentially in how they interpret the value field . ( Abov... | Python - typechecking OK when error would n't be thrown otherwise ? |
Python : I wanted to see if shlex was a good choice for something I 'm trying to build , so I thought I 'd put it in debug mode to play around with it . Only , shlex 's constructor has this weird thing it does : it sets self.debug to 0 and then immediately checks if it 's true.I know Python has some powerful metaprogra... | Putting shlex in debug mode |
Python : A while back , I was working on a programming problem ( CCC ) . I have also come across similar questions in past contests so I decided to ask about this one . The problem is basically this . You are given n people and p pieces of pie.n people are standing in a row.You must distribute p pieces of pie amongst t... | Converting simple recursive method which recurses within a loop into iterative method |
Python : We have a dictionary d1 and a condition cond . We want d1 to contain only the values that satisfy the condition cond . One way to do it is : But , this creates a new dictionary , which may be very memory-inefficient if d1 is large.Another option is : But , this modifies the dictionary while it is iterated upon... | Efficiently filtering a dictionary in-place |
Python : Consider the following instance behavior in Python.The Python snippet below prints Should n't it print Why would an element in a list by successfully overwritten , but not the entire list object ? <code> def change ( elements ) : elements [ 0 ] = 888 elements = [ -3 , -1 , -2 , -3 , -4 ] print ( elements [ 0 ]... | Python instance behavior with lists |
Python : I have a scalar function f ( a , b , c , d ) that has the following permutational symmetryf ( a , b , c , d ) = f ( c , d , a , b ) = -f ( b , a , d , c ) = -f ( d , c , b , a ) I 'm using it to fully populate a 4D array . This code ( using python/NumPy ) below works : But obviously I 'd like to exploit symmet... | How to exploit permutational symmetry in this loop ? |
Python : I would like to know if the rows selected by : are the same as the rows selected by : In this case the order of the rows does n't matter.Is there any case in which groupby does not fulfill the commutative property ? <code> groupby ( [ ' a ' , ' b ' ] ) groupby ( [ ' b ' , ' a ' ] ) | Is groupby from pandas commutative ? |
Python : I have a pandas dataframe of the following structure : I want to remove duplicate rows where ID and Val1 are duplicates , and where Val2 sums to zero across two rows . The positive/negative Val2 rows may not be consecutive either , even under a groupbyIn the above sample data , rows 0 and 1 , as well as 7 , 8 ... | Deleting rows which sum to zero in 1 column but are otherwise duplicates in pandas |
Python : I have seen many online examples with different ways of importing modules . I was wondering what the difference is , if it is in speed , accuracy , priority , or psychology.The first , and most common is ; I understand the methodry , but this seems unnecessary when you can use , like I personally do ; Less lin... | What is the difference between these import statements ? |
Python : I 've hit a wall with a data analysis project I 'm working on . Essentially , if I have example CSV ' A ' : And I have example CSV ' B ' : If I perform a merge using Pandas , it ends up like this : How could I instead make it become : This is my code : I would really appreciate any help - I 'm very stuck ! And... | Prevent duplication of rows when performing merge |
Python : I want to do a multiple queries . Here is my data frame : I have 3 queries : Group A or BMath > EngName starts with ' B ' I tried to do it one by oneThen , I tried to merge those queriesI also tried to pass str.startswith ( ) into df.query ( ) I have tried lots of ways but no one works . How can I put those qu... | How to do multiple queries ? |
Python : I 'm facing strange error right now , I have python script , that is sending/receiving data using TCP socket , everything works fine , but when I 'm trying to download image with this script , it will download it , but there is a missing one-pixel row . Any ideas on how to fix it ? Server download script : Cli... | Missing one-pixel row while transfering image with TCP socket |
Python : I am looking for a way to dynamically create classes with specific properties accessible via typical instance notation.Details of how the `` props '' are actually acquired and modified would be hidden.This also makes it easier to add access to new props as they become available.I have experimented with techniq... | creating class properties dynamically |
Python : I 'm trying to export a list of strings to csv using comma as a separator . Each of the fields may contain a comma . What I obtain after writing to a csv file is that every comma is treated as a separator.My question is : is it possible to ignore the commas ( as separators ) in each field ? Here is what I 'm t... | Python write to csv with comas in each field |
Python : Currently I have the following lists : What I am trying to do is to replace the characters in the instruments list with the characters from the score list ( excluding the | ) .I am currently experiencing the following issuesThe characters are being replaced row by row , rather than column by column . Instrumen... | Replace characters in a list by column rather than by row |
Python : Say I have a list of class objects in Python ( A , B , C ) and I want to inherit from all of them when building class D , such as : Unfortunately I get a syntax error when I do this . How else can I accomplish it , other than by writing class D ( A , B , C ) ? ( There are more than three classes in my actual s... | Inheriting from classes unpacked from a list |
Python : I know that I can split a list into sub-lists of equal size using : However I 'm not sure how to split a list of length k^m into sub-lists , then further sub-lists until each sub-list has length of 1.For example : Whenever I 've tried to loop this I get tied in knots , is there a short-cut ? <code> segment = l... | How to split sub-lists into sub-lists k times ? ( Python ) |
Python : I 'm trying to do some calculations in my python script but i 'm getting some weird results . For example : If I upscale the numbers I get the expected results : I 'm pretty sure that the answer for the first code snippet should be 3.0 and not 2.0 . Can someone explain me why this is happening and how to fix i... | Floor division with small numbers returning wrong answer |
Python : I see that one could have several versions of a Python package installed : How might I check which version of a package ( i.e . which file , not which version number ) an application is using ? Ignoring the obvious `` Zim will use the package at /usr/lib/pymodules/python2.7/zim/signals.py '' is there way to se... | Which package is Python using ? |
Python : I stumbled upon some strange behaviour using ipython-notebook and wondered what , if any , the purpose was . If you enter a semicolon before a function call , you get the result of applying the function to a string which reflects all the code after the function name . For example , if I do ; list ( 'ab ' ) I g... | Weird behaviour with semicolon before function call in ipython/ipython notebook |
Python : Say I have a listand I want to sum each item in the list with every other item in the list . I could do this : Is assigning two variables ( a and b ) to items in the same list ( l ) the best way to access and perform operations on those items ? Is there a better way to do this ? I 've looked at list methods an... | Is assigning two variables to items in the same list the best way to access and perform operations on those items ? |
Python : Notes on Decimal says : I do n't understand why Decimal ( ' 3.14 ' ) + 2.71828 is undefined . Decimal can be constructed from a float so I think that __add__ can be implemented as follows : With it we will be able to get Decimal ( ' 3.14 ' ) + 2.71828 = Decimal ( ' 3.14 ' ) + Decimal ( 2.71828 ) = 5.8582800000... | Why decimals do not interoperate with floats |
Python : Suppose I have the following set : I would like to find out if either foo or bar exists in the set . I 've tried : This works , but is there not a more Pythonic way of doing this check without having multiple or statements ? I ca n't find anything in the standard Python set operations that can achieve this . U... | Check for any values in set |
Python : Using the below as an example , we can see x.giveMyNum ( ) will be called 4 times - 3 times to check the value of myNum and once to construct the list to return . You 'd probably want it to be called only 3 times , as it 's a pure function and its value wo n't change.List Comprehension Version : I know you can... | Preventing multiple calls in list comprehension |
Python : I want to split a string using - , += , == , = , + , and white-space as delimiters . I want to keep the delimiter unless it is white-space.I 've tried to achieve this with the following code : I expected the output to beHowever I gotWhich is almost what I wanted , except that there are quite a few extraneous N... | Python regex -- extraneous matchings |
Python : I am trying to do a cross tab based on one column where a third column matches . Take the example data : where id_match matches i want to find the resulting sum of of the time for the cross tab of the demographic column . The output would look like this : Hopefully that makes sense , comment if not . Thanks J ... | Cross tab on one column where third column is matched |
Python : I 'm trying to make a function that will always return me a pre-fixed number of elements from an array which will be larger than the pre-fixed number : where i stands for index of array to fetch and arr represent the array of all elements : Example : where i = 9 and the array return the [ 9:11 ] + [ 0:7 ] to c... | Python how cyclic fetch a pre-fixed number of elements in array |
Python : So I ’ m trying to write a Python 3 function for a challenge that takes in a string , removes the vowels and returns it without the vowels . I wrote the below code but it seems to only take out the vowels partially while leaving some untouched . <code> def remove_vowels ( string ) : vowels = [ ' a ' , ' e ' , ... | Why is my function partially doing what it ’ s supposed to do ? |
Python : Look at this Python code : It prints False . That 's weird by itself , but becomes much weirder when you consider the following : If x is a number ( int , float , complex , Fraction , Decimal ) instead of a string , it still prints False . For bytes and bytearray , too . But for every other type ( hashable if ... | Strings not referenced by dicts ? |
Python : I 've been tasked with creating a dictionary whose keys are elements found in a string and whose values count the number of occurrences per value.Ex . I have the for-loop logic behind it here : This does exactly what I want it to do , except with lists instead of dictionaries . How can I make it so counter bec... | Nested for-loops and dictionaries in finding value occurrence in string |
Python : I 'm developing a grid based game in pygame , and want the window to be resizable . I accomplish this with the following init code : As well as the following in my event handler : The problem I 'm having is that it seems a pygame.VIDEORESIZE event is only pushed once the user is done resizing the window , i.e ... | Update during resize in Pygame |
Python : How do I use numpy / python array routines to do this ? E.g . If I have array [ [ 1,2,3,4 , ] ] , the output should be Thus , the output is array of double the row and column dimensions . And each element from original array is repeated three times . What I have so far is thisThis gives me array for the inputT... | How to replace each array element by 4 copies in Python ? |
Python : I 'm looping over a heavily nested dictionary of lists ( system information ) and storing the complete path to keys in this format : Next , the complete paths are read in and will be compared to the system information ( Data ) . How can I convert the complete path to this format ? I can do something like : How... | Python store dictionary path and read back in |
Python : I know I can attach a function to a class and make it a method : To my surprise this works also with a bound method from one class to another : Can I safely use this ? Is there something I am overseeing ? updateOne caveat that I found already : Even though I called the method from B , It seems bound to Foo.And... | Safely bind method from one class to another class in Python |
Python : I have this plot : The values range from 0 to 1 , but the colorbar extends above 1 and below 0 . I want the colorbar to NOT show values out of the [ 0 , 1 ] range . How can this be done ? My code : <code> import numpy as npimport plotly.graph_objects as gofig = go.Figure ( ) fig.add_trace ( go.Contour ( z=np.r... | Colorbar does n't respect limit values |
Python : A bit of background : I have a Raspberry Pi 3b running Raspbian ( Debian ) 9.11 . This original Pi runs a Python 3 script that captures text input from a handheld scanner and sends it into a MySQL database , and then plays a wav file so the employees scanning know it was successful . I daemonized this process ... | Pygame wo n't play audio , but only when running as a daemon |
Python : I want to preface this by saying that I know the difference between == and is one is for references and the other is for objects . I also know that python caches the integers in the range ( -5 , 256 ) at startup so they should work when comparing them with is . However I have seen a strange behaviour.This is t... | Python 3.6.5 `` is '' and `` == '' for integers beyond caching interval |
Python : I 'm getting started to AsyncIO and AioHTTP , and i 'm writing some basic code to get familiar with the syntax . I tried the following code that should perform 3 requests concurrently : Here is the output : I do n't understand why do i get that error , can anyone help me on this ? <code> import timeimport logg... | Asyncio event loop is closed when using asyncio.run ( ) |
Python : Here I am trying to get data from arduino but it is coming in the format b'29.20\r\n ' . I want to have the data in the format `` 29.20 '' so I can plot it.I tried ardstr = str ( ardstr ) .strip ( '\r\n ' ) and ardstr.decode ( 'UTF-8 ' ) but none of them is working . My python version is 3.4.3.What can I do to... | How to convert the byte class object into a string object |
Python : I am working with python and I am trying to find powers of really large numbers but something interesting which happens is that this throws a math overflowbut this below seems to work although I do not know if the value returned is correctAnybody aware why this happens <code> math.pow ( 1000 , 1000 ) 1000**100... | Why does one of these code segment work while the other throws an overflow |
Python : I have list like belowI want add the elements based on index if 1st sublist element match with other list sublist elementtried with below : but output resulting like below : but correct output should be : <code> a= [ [ ' a',1,2,1,3 ] , [ ' b',1,3,4,3 ] , [ ' c',1,3,4,3 ] ] b= [ [ ' b',1,3,4,3 ] , [ ' c',1,3,4,... | Adding sublists elements based on indexing by condition in python |
Python : I have a C # .NET classes that exist outside of a namespace that need to be accessed inside of IronPython . Typically I would do : However , I do not have a namespace . <code> import SomeNamespacefrom SomeNamespace import * | How do I import non namespaced types into IronPython ? |
Python : In finance , futures contracts are usually represented by their expiry year and month . So for example , 201212 would be 2012 - December.Some contracts , for example Corn , are only traded some months [ 3,5,7,9,12 ] , whereas sometimes , you might only want to trade the [ 12 ] contract ( despite it trading oth... | Implementing a custom counting system in Python |
Python : I have a dataframe like this , and I want to find the rows that contains list in that column . I tried value_counts ( ) but it tooks so long and throws error at the end . Here is the error : For bigger dataframes this tooks forever.Here is how the desired output look like : <code> import pandas as pddf = pd.Da... | How to check if a column contains list |
Python : I 'm trying to take this dataframe ( with 1 row in this example ) : and to transform it to this : as you can see I need to change the value in respond to the columns and create rows , I understood I can do it using melt , but I 'm having hard time doing it.Please help me with that ... ..Thank you ! <code> id D... | melt columns and add 20 minutes to each row in date column |
Python : today I bring you an apparently simple question , that it 's not so simple as it seems ( for me at least ) ! Imagine I have the following list of integers : And I want to print `` $ '' corresponding with the height i.e : prints this : However I want the former displayed ! I tried this : But after a while I und... | Print a list of heights with `` # '' symbol |
Python : I want a commet in pygame to shoot across the screen . Here is my commet classThen i added 20 commets to the self.commets list.I am having two problems . The first problem being moving the commet . To move it i did thisFor x- coordinate i just added 2 to its value every frame . However , for the yvalue of the ... | Moving a comet in pygame |
Python : I 'm new to python ( and coding in general ) , I 've gotten this far but I 'm having trouble . I 'm querying against a web service that returns a json file with information on every employee . I would like to pull just a couple of attributes for each employee , but I 'm having some trouble.I have this script s... | How do I pull a recurring key from a JSON ? |
Python : For a self-project , I wanted to do something like : As you can see , I do n't really need more than one instance of Species ( id ) per id , but I 'd be creating one every time I 'm creating an Animal object with that id , and I 'd probably need multiple calls of , say , Animal ( somename , 3 ) .To solve that ... | Attempting to replicate Python 's string interning functionality for non-strings |
Python : I 'm trying to fit a cubic spline to the data points below , I 'm a bit confused when I would use a Param like the example m.x = m.Param ( value=np.linspace ( -1 , 6 ) ) or when I would use a constant Const . <code> import numpy as npfrom gekko import GEKKOxm = np.array ( [ 0 , 1 , 2 , 3 , 4 , 5 ] ) ym = np.ar... | When do I use Param rather than Const in Gekko ? |
Python : I 'm trying to get the files from specific folders in s3 Buckets : I have 4 buckets in s3 with the following names : The folder structure for all s3 buckets looks like this : I have to check if this folder prefix processed/files is present in the bucket , and if it is present , I 'll read the files present in ... | search in each of the s3 bucket and see if the given folder exists |
Python : I feel like this should be done very easily , yet I ca n't figure out how . I have a pandas DataFrame with column date : I want to have a columns of durations , something like : My attempt yields bunch of 0 days and NaT instead : Any ideas ? <code> 0 2012-08-211 2013-02-172 2013-02-183 2013-03-034 2013-03-04Na... | Dates to Durations in Pandas |
Python : I 'm looking for a short readable way to select some rows of an 2D numpy.ndarray , where the first number of each row is in some list . Example : So in this case i only need because the first numbers of these rows are 4 and 8 which are listed in index . Basically im looking for something like : which of course... | Select rows of numpy.ndarray where the first row number is inside some list |
Python : All the Python docs I 've read appear to indicate that , side-effects aside , that if you import module A and then reference A.a , you are referencing the same variable as if you wrote `` from A import a '' .However , that does n't appear to be the case here and I 'm not sure what 's going on . I 'm using Pyth... | Why does from ... import appear to bind to value at import time in Python ? |
Python : If need to say I found this powerful construct to extract matching strings from a list : ... but this is hard to read and overkill . I do n't want the list , I just want to know if such a list would have anything in it.Is there a simpler-reading way to get that answer ? <code> if < this list has a string in it... | Check if a list has one or more strings that match a regex |
Python : I have two dataframesresults : acctypeDF : I wanted to combine both these dataframes into one so i did : But the output is : As you can see the output is repeating the index number 0.Why does this happen ? My objective is to drop the first index ( first column ) which has addresses , but I am getting this erro... | Why does my output dataframe have two columns with same indexes ? |
Python : I 'm writing a class that has a number of methods operating on similar types of arguments : There 's a certain convention about these arguments ( e.g . data/params should be numpy.farrays , interval - a list of 2 floats ) , but I 'd like to allow user to have more freedom : e.g . functions should accept int as... | Pythonic way of converting parameters to the same standard within all methods of a class |
Python : I 'm playing with a simple script to escape certain HTML characters , and am encountering a bug which seems to be caused by the order of elements in my list escape_pairs . I 'm not modifying the lists during a loop , so I ca n't think of any Python/programming principles I 'm overlooking here.returnsHowever wh... | Can the order of elements in a list cause a bug in a for loop ? |
Python : Is there a numpy function that will convert something like : to an array of start/end pairs for the contiguous ranges , as : <code> [ 0 , 1 , 0 , 1 , 1 , 1 , 0 , 1 , 1 ] [ [ 1 , 2 ] , [ 3 , 6 ] , [ 7 , 9 ] ] | Convert boolean index to start/end pairs for runs |
Python : The following code gives me error ValueError : Shapes ( None , 3 , 2 ) and ( None , 2 ) are incompatible . What I want to do is to construct a multi-task network . How should I resolve it ? I am using Tensorflow 2.3.0 . <code> import numpy as npimport tensorflow as tffrom tensorflow.keras.layers import GlobalA... | How to fix Keras ValueError : Shapes ( None , 3 , 2 ) and ( None , 2 ) are incompatible ? |
Python : I 've a listand a list of dictionariesI want to sort this list_of_dct by the order given in order list , i.e . the output should be the following : I know how to sort by a given key , but not when an order is already given . How can I sort it ? PS : I already have an O ( n^2 ) solution . Looking for a better s... | Sort a list of dictionary provided an order |
Python : I got a DataFrame with 3 levels of Index and I need to reindex the third level without changing the first and the second level.I have a DataFrame like this : And I would like a DataFrame like this : I want the third index to be the same everywhere <code> tuples = [ ( ' A ' , ' a ' , 1 ) , ( ' A ' , ' a ' , 3 )... | Reindex specific level of pandas MultiIndex |
Python : Is there a way to identify leading and trailing NAs in a pandas.DataFrameCurrently I do the following but it seems not straightforward : Any ideas how this could be expressed more efficiently ? Answer : <code> import pandas as pddf = pd.DataFrame ( dict ( a= [ 0.1 , 0.2 , 0.2 ] , b= [ None , 0.1 , None ] , c= ... | Identify leading and trailing NAs in pandas DataFrame |
Python : I have a DataFrame like thisI want to obtain a DataFrame Like this <code> gauge satellite1979-06-23 18:00:00 6.700000 2.4843781979-06-27 03:00:00 NaN 8.8914601979-06-27 06:00:00 1.833333 4.0534601979-06-27 09:00:00 NaN 2.8766491979-07-31 18:00:00 6.066667 1.438324 gauge satellite1979-06-23 18:00:00 6.700000 2.... | How to change entire row if NaN present if a single column has NaN |
Python : I want to raise exceptions that communicate some message and a value related to the error . I 'm wondering when it 's most appropriate to declare custom exceptions versus using the built-ins.I 've seen many examples like this and many more like it being recommended on other sites.I am much more inclined to wri... | When should I declare custom exceptions ? |
Python : I am trying to a obtain a specific dictionary from within a list that contains both tuples and dictionaries . How would I go about returning the dictionary with key ' k ' from the list below ? <code> lst = [ ( 'apple ' , 1 ) , ( 'banana ' , 2 ) , { ' k ' : [ 1,2,3 ] } , { ' l ' : [ 4,5,6 ] } ] | Tuples and Dictionaries contained within a List |
Python : Consider the following : I just thought it was a very strange restriction <code> st = `` Hi : % s , you are : % d '' x = [ 'user ' , 25 ] st % x # Does n't workst % ( `` user '' , 25 ) # Worksst % ( *x , ) # Works | Why can you format against a tuple but not a list ? |
Python : I have an excel file where some of the rows are merged . Please find the snippet of the file below.And I want my file to look like the this : .As you can see First String and Second String are irrelevant to my data and I want to drop that row . Here is my trial.Where excel_file is the excel file I have importe... | How to remove the merged rows in excel using python ? |
Python : For instance , I want to use numpy 's isnan function . I 've already loaded the pandas library : That works , but is there any disadvantage to that ? Or should I writeWhat is good practice ? <code> import pandas as pdpd.np.isnan ( 1 ) # = > False import pandas as pdimport numpy as npnp.isnan ( 1 ) # = > False | Is it unpythonic to use a package imported by another package , or should I import it directly ? |
Python : For example , I have two arrays : How can I generate a pandas dataframe with every combination of x and y , like below ? <code> import numpy as npx = np.array ( [ 1,2,3 ] ) y = np.array ( [ 10 , 11 ] ) x y1 101 112 102 113 103 11 | How to generate 2D mesh from two 1D arrays and convert it into a dataframe ? |
Python : I have a 3-level MultiIndex dataframe and I would like to slice it such that all the values until a certain condition is met are kept . To make an example , I have the following dataframe : And I would like to select all the values until Col1 becomes smaller than Col2 . As soon as I have an instance for which ... | How to slice a pandas MultiIndex df keeping all values until a certain condition is met ? |
Python : Expected output : Actual output : Is using unpacking assignment in combination with extended slice assignment not possible for some reason ? Why ? I do n't see anything obvious in PEP 3132 -- Extended Iterable Unpacking or in the Python datamodel suggesting this should n't be valid . <code> L = [ 0 , 1 , 2 ] L... | Iterable unpacking and slice assignment |
Python : For some reason I ca n't seem to be able to update keys in the us-central1 region . My IAM have both the update and list roles and I use this code : It gives me the following error : google.api_core.exceptions.NotFound : 404 The request concerns location 'us-central1 ' but was sent to location 'global ' . Eith... | Ca n't update cryptokey in us-central1 |
Python : I have an issue with customizing the legend of my plot . I did lot 's of customizing but couldnt get my head around this one . I want the symbols ( not the labels ) to be equally spaced in the legend . As you can see in the example , the space between the circles in the legend , gets smaller as the circles get... | Matplotlib , vertical space between legend symbols |
Python : My dataframe looks like this ; If col1 contains the value 1 in column 2 I want to forward fill with 1 n number of times . For example , if n = 4 then I would need the result to look like this.I think I could do this using a for loop with a counter that resets every time a condition occurs but is there a faster... | Forward fill column on condition |
Python : In my application I have a lot of conditions under which it is non-sensical to run the app further.Currently I do something like this : There is a lot of boilerplate so I 'd like to avoid it . I 'm looking for something that would allow me to pass the string Some short description as a parameter and automate h... | How to handle exception and exit ? |
Python : ( I 'm not sure if this question belongs here or CS forum . I kept it here because it has Python-specific code . Please migrate if needed ! ) I 'm studying algorithms these days , using Python as my tool of choice . Today , I wanted to plot the running times three variations of a simple problem : Compute the p... | These Python functions do n't have running times as expected |
Python : Why does C += [ 5 ] modifies A but D = D + [ 5 ] does n't ? Is there any difference between = and += in python or any other language in that sense ? <code> > > > A = [ 1,2,3,4 ] > > > D = A > > > D [ 1 , 2 , 3 , 4 ] > > > D = D + [ 5 ] > > > A [ 1 , 2 , 3 , 4 ] > > > C = A > > > C += [ 5 ] > > > A [ 1 , 2 , 3 ... | Adding to lists in Python 2.7 |
Python : I regularly have a group of ( semantically ) related dynamic variables that are accessed by multiple methods and altered during runtime . I am currently fluctuating between three ways of highlighting their `` family '' and reduce the conceptual clutter in main : variable name prefix , use a class , or use a di... | Pythonic way to hold related variables ? |
Python : Going off of the examples/basics/visuals/graphy.py , I tried to display a histogram but failed : and yet the text visual works just fine . I understand histogramVisual is a subclass of mesh , but I did n't see anything useful in the source code of mesh.py . I am using wx as my backend . <code> from vispy impor... | vispy visual.HistogramVisual |
Python : I noticed a surprising behavior when trying to concatenate lists and tuples . Usually , they do n't mix : results in : TypeError : can only concatenate tuple ( not `` list '' ) to tupleand , vice versa gives : TypeError : can only concatenate list ( not `` tuple '' ) to listSo far , nothing was unexpected.Howe... | Inconsistent behavior concatenating lists and tuples in python |
Python : Given a starter string , and a number of spaces needing to be added to a string , is there an easy way to do this ? If the number of spaces is uneven spread , add spaces left to right.This is what I 've tried : dividing space number with actual string spacestokenize stringIf first word just add the current wor... | Given amount of spaces needed to be added , format string by adding spaces between words |
Python : I am attempting to generate a dataframe ( or series ) based on another dataframe , selecting a different column from the first frame dependent on the row using another series . In the below simplified example , I want the frame1 values from ' a ' for the first three rows , and ' b for the final two ( the picke... | Select columns in a DataFrame conditional on row |
Python : How can I detect if user pressed the @ sign in pygame ? On some keyboard I need to press SHIFT + 2 , on others ALT + V , etc.This works : This does n't : This works only on one type of keyboard : So how can I detect if the user press @ without knowing the type of keyboard they use ? Thanks for the help . <code... | Detect if user pressed @ sign in pygame |
Python : I 'm trying to write a function right now , and its purpose is to go through an object 's __dict__ and add an item to a dictionary if the item is not a function . Here is my code : If I 'm not mistaken , inspect.isfunction is supposed to recognize lambdas as functions as well , correct ? However , if I write t... | Adding items to a list if it 's not a function |
Python : I need to create a function that takes the parameters ( character , stringOne , stringTwo ) . The function returns a new word which contain the same data as stringTwo + whatever characters in stringOne in the same position.Example : stringOne = `` apple '' stringTwo = `` 12345 '' character = `` p '' Should Ret... | Replacing characters from string one to string two |
Python : I struggle with making lambdas work . The code here is example , but it shows my problem well.This give me 16 , but I expect to have different value for different lambda . Why is happening ! <code> lambdas = list ( ) for i in range ( 5 ) : lambdas.append ( lambda x : i*i*x ) print lambdas [ 0 ] ( 1 ) print lam... | Why my lambdas do not work ? |
Python : I have a bunch of module imports that are the same across foo.py , bar.py , and baz.py . Is there a way I can do the imports in __init__.py ? What would I have to write in foo.py ? <code> pkg/ __init__.py foo.py bar.py baz.py | Importing across a python package |
Python : In my code , df is defined like thisI have a [ 86 rows x 1 columns ] dataframe df which looks like this on print ( df ) I wish to write a code that would merge the Male and Female entries like thisThe final task I need to do is to .sum ( ) the male row and then the female row to get the total of each sex . I a... | How to sum rows with the same keys ? |
Python : I have the following list of tuplesAnd I need to output the following textI have tried And it provides the following listBut have n't found an efficient way of getting the desired output , and it must work for a list of tuples of different sizes . <code> a = [ ( 5 , 2 ) , ( 2 , 4 ) ] ( 5,2 ) ( 2,4 ) [ `` , '' ... | Join a list of tuples with a formatting in an efficient manner |
Python : I have DataFrame in which there is a column with event dates ( dates are not unique ) . I need to select all the data that is in this period . I try next : The type of column Transaction_date is datetime64 [ ns ] .When I run the code with the request for the period 01/01/2020 to 31/01/2020 - part of the data f... | Pandas : Select all data from Pandas DataFrame between two dates |
Python : I have an array a = [ 1 , 2 , 3 , 4 , 5 , 6 ] and b = [ 1 , 3 , 5 ] and I 'd like to map a such that for every element in a that 's between an element in b it will get mapped to the index of b that is the upper range that a is contained in . Not the best explanation in words but here 's an exampleSo the final ... | Python - easy way to `` comparison '' map one array to another |
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