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Python : I have a 2d array , and I have some numbers to add to some cells . I want to vectorize the operation in order to save time . The problem is when I need to add several numbers to the same cell . In this case , the vectorized code only adds the last . ' a ' is my array , ' x ' and ' y ' are the coordinates of th... | How to vectorize increments in Python |
Python : I have got a chunk of code likewhere a and b are arrays of the same length , a is given ( and big ) , func is some function that has a lot of local variables but does not use any global variables . I would like to distribute computations of func across several CPUs . Presumably I need to use multiprocessing mo... | Parallelizing multiplication of vectors-like computation in python |
Python : When I changed to : I found the second code is much more efficient , why ? bench mark it , and in my situation ranks is an numpy array of integer . The difference is much more.output : <code> for i in range ( 0 , 100 ) : rank = ranks [ i ] if rank ! = 0 : pass for i in range ( 0 , 100 ) : rank = ranks [ i ] if... | in python why if rank : is faster than if rank ! = 0 : |
Python : Recently I ran into cosmologicon 's pywats and now try to understand part about fun with iterators : Ok , sorted ( a ) returns a list and sorted ( a ) == sorted ( a ) becomes just a two lists comparision . But reversed ( a ) returns reversed object . So why these reversed objects are different ? And id 's comp... | Understanding iterable types in comparisons |
Python : While looking for a pythonic way to rotate a matrix , I came across this answer . However there is no explanation attached to it . I copied the snippet here : How does it work ? <code> rotated = zip ( *original [ : :-1 ] ) | How does this code snippet rotating a matrix work ? |
Python : Is there any bulid-in function in python/numpy to convert an array = [ 1 , 3 , 1 , 2 ] to something like this : <code> array = [ [ 0 , 1 , 0 , 0 ] , [ 0 , 0 , 0 , 1 ] , [ 0 , 1 , 0 , 0 ] , [ 0 , 0 , 1 , 0 ] ] | How to covert 1d array to Logical matrix |
Python : I have time series data in the following format , where a value indicates an accumulated amount since the past recording . What I want to do is `` spread '' that accumulated amount over the past periods containing NaN so that this input : Becomes this output : Is there an idiomatic Pandas way to do this rather... | Pandas idiomatic way to custom fillna |
Python : I 'm trying to create a recursive generator in Python , but I 'm doing something wrong . Here 's a minimal example . I would expect the function f ( ) to return an iterable that would give me all the positive numbers > = n.Why is the iteration stopping after the first number ? <code> > > > def f ( n ) : ... yi... | Why Recursive Generator does n't work in Python 3.3 ? |
Python : Given the following simple regular expression which goal is to capture the text between quotes characters : When the input is something like : The capturing group ( 1 ) has the following : I expected the group ( 1 ) to have text only ( without the quotes ) . Could somebody explain what 's going on and why the ... | Strange behavior of capturing group in regular expression |
Python : I wrote some small code for controlling multiple compute engine on google cloud platform . The whole file is here in github.The part causes problem is gcloud compute ssh in the followingThis part is for uploading the same file ( usually .zip ) to all instances with same tag . However doing it on my local compu... | How to avoid gcloud compute alerting store the key in cache |
Python : I 'm reading a file ( while doing some expensive logic ) that I will need to iterate several times in different functions , so I really want to read and parse the file only once.The parsing function parses the file and returns an itertools.groupby object.I thought about doing the following : However , itertool... | Using itertools.tee to duplicate a nested iterator ( ie itertools.groupby ) |
Python : I am trying to add dictionaries which have a key from each element from the list and value ( s ) from one following element from the list and a count for the number of times it follows it , in dictionary format . For example , if we have the list of words , [ 'The ' , 'cat ' , 'chased ' , 'the ' , 'dog ' ] and... | Making a dictionary for value in a dictionary in Python |
Python : Using pandas v1.0.1 and numpy 1.18.1 , I want to calculate the rolling mean and std with different window sizes on a time series . In the data I am working with , the values can be constant for some subsequent points such that - depending on the window size - the rolling mean might be equal to all the values i... | Pandas rolling std yields inconsistent results and differs from values.std |
Python : I am trying out the list comprehensions . But I got stuck when I tried to write a list comprehension for the following code.output for this is : Is it even possible to write a list comprehension for this code ? if it is how would you write it ? <code> a = [ ' x ' , ' y ' , ' z ' ] result = [ ] for i in a : for... | List comprehension for multiplying each string in a list by numbers from given range |
Python : I discovered a slightly strange corner of Python I was hoping to get some help understanding . Suppose I have a class B that I want to attach as a method for class A. I can do : When I call a.B ( ) , in the B.__init__ I get a self object for a new B instance.Now suppose I want to capture the actual value of th... | Attaching class as method |
Python : I would like to slice a dataframe to return rows where element x=0 appears consecutively at least n=3 times , and then dropping the first i=2 instances in each mini-sequenceis there an efficient way of achieving in pandas , and if not , using numpy or scipy ? Example 1Desired output : Example 2x=0 ( element of... | slice pandas df based on n consecutive instances of element |
Python : I 'm quite new at TensorFlow . I 'm using TF 1.8 for a 'simple ' linear regression.The output of the exercise is the set of linear weights that best fit the data , rather than a prediction model . So I would like to track and log the current minimum loss during training , along with the corresponding value of ... | Can I log training loss via a hook with a LinearRegressor ? |
Python : To better understand Python 's generator I 'm trying to implement facilities in the itertools module , and get into trouble with izip : My code uses the ERROR line , and the reference implementation ( given in the manual ) uses the OK line , not considering other tiny differences . With this snippet : My code ... | Why does this implementation of izip ( ) not work ? |
Python : So I 'm taking a programming course in high school , right now and I am making a program of a game that the teacher assigned for all of us make . The game is called `` game of sticks '' ( if you would like a better run down on how the game works skip about half way through this video https : //www.youtube.com/... | Python 3 need help in a school project |
Python : I 'm trying to use SQLAlchemy to write a query like this : My data table has 3 columns , parent_id , date_time and value.I 've spend few hours already and there 's no way I can get it to work exactly like above.The closest I 've got ( at least semantically it make sense ) is : But its not working , it 's not p... | How to join subquery results to function results |
Python : I 've been working extensively with dates in python/django . In order to solve various use-cases I 've been blindly trying a variety of different approaches until one of them worked , without learning the logic behind how the various functions work.Now it 's crunch time . I 'd like to ask a couple of questions... | Django/python - dispelling confusion regarding dates and timezone-awareness |
Python : Why exactly isprinted by the following code ? In particular : Why is C.__init__ ( ) not printed ? Why is C.__init__ ( ) printed if I put super ( ) .__init__ ( ) instead of A.__init__ ( self ) ? <code> A.__init__ ( ) B.__init__ ( ) D.__init__ ( ) # ! /usr/bin/env python3class A ( object ) : def __init__ ( self ... | Why is an __init__ skipped when doing Base.__init__ ( self ) in multiple inheritance instead of super ( ) .__init__ ( ) ? |
Python : I am making a library that deals with Python modules . Without getting into details , I need a list of the common Python module extensions.Obviously , I want .py , but I 'd also like to include ones such as .pyw , .pyd , etc . In other words , I want anything that you can import.Is there a tool in the standard... | Is there an easy way to get all common module extensions ? |
Python : I 've currently got a list of tuples ( though I control creation of the list and tuples , so they could be altered in type if needed ) . Each tuple has a start and end integer and a string with an ID for that range 's source . What I 'm trying to do is identify all of the overlapping ranges within the tuples.C... | Identify all overlapping tuples in list |
Python : Lets say I want to use gcc from the command line in order to compile a C extension of Python . I 'd structure the call something like this : I noticed that the -I , -L , and -l options are absolutely necessary , or else you will get an error that looks something like this . These commands tell gcc where to loo... | Return the include and runtime lib directories from within Python |
Python : I have data in pandas dataframe with 1 minute time step . This data is not recorded continuously , now I would like to split all my data into separate event based on the condition below : If there is continuous data recorded for 5min or more then only it is considered as a event and for such event data need to... | Calculating event based on the continuous timestep |
Python : I 'm attempting to make a short program that will return the factorial of a number , which works fine . The only problem I am having is getting the program to end if the user inputs a non-integer value . <code> num = input ( `` input your number to be factorialised here ! : `` ) try : num1 = int ( num ) except... | ending a program early , not in a loop ? |
Python : I have a pandas dataframe with name of variables , the values for each and the count ( which shows the frequency of that row ) : I want to use count to get an output like this : What is the best way to do that ? <code> df = pd.DataFrame ( { 'var ' : [ ' A ' , ' B ' , ' C ' ] , 'value ' : [ 10 , 20 , 30 ] , 'co... | Groupby in Reverse |
Python : Can anyone explain me the output of following python code : Testing the function <code> from theano import tensor as Tfrom theano import function , shareda , b = T.dmatrices ( ' a ' , ' b ' ) diff = a - babs_diff = abs ( diff ) diff_squared = diff ** 2f = function ( [ a , b ] , [ diff , abs_diff , diff_squared... | Neural Networks : Understanding theano Library |
Python : I have a dataframe like this : Further , I have a variable max_sum = 10.I want to assign a group to each row ( i ) based on the value in keys and ( ii ) the max_sum which should not be exceeded per group.My expected outcome looks like this : So , the first two values in the a group ( 1 and 5 ) sum up to 6 whic... | How to assign groups based on a maximum sum ? |
Python : I have implemented a function in R to estimate the Gaussian Process parameters of a basic sin function . Unfortunately the project has to be made in Python and I have been trying to reproduce the behavior of R library 's hetGP in python using SKlearn but I have a hard time mapping the former to the later.My un... | Reproducing R 's gaussian process maximum likelihood regression in Python |
Python : I have an `` interface '' that will be implemented by client code : run should in general return a docutils node but because the far far mostcommon case is plain text , the caller allows run to return a string , which will bechecked using type ( ) and turned into a node.However , the way I understand `` Python... | How can I balance `` Pythonic '' and `` convenient '' in this case ? |
Python : Input to pd.read_clipboard ( ) Code : Output : Questions : Why that � in the last row ? How to modify more than 1 column in 1 line ? Python Version : 2.7 , Pandas : 0.19 , IPython : 4 <code> Ratanhia ,30c x2 , 200c x2Aloe ,30c x2 , 200c x2Nitric Acid ,30c x2 , 200c x 2Sedum Acre ,200c x2 , 30c x2Paeonia ,200c ... | Error in parsing , update multiple columns in 1 line |
Python : I have three arrays called RowIndex , ColIndex and Entry in numpy . Essentially , this is a subset of entries from a matrix with the row indexes , column indexes , and value of that entry in these three variables respectively . I have two numpy 2D arrays ( matrices ) U and M. Let alpha and beta be two given co... | Is there a faster way to do this pseudo code efficiently in python numpy ? |
Python : I have been playing with Python these days , and I realize some interesting way how Python assign id ( address ) to new instance ( int and list ) . For example , if I keep call id function with a number ( or two different number ) , it return the same result . e.g.Also when I declare the variable first and the... | Python reference to an new instance alternating |
Python : fairly new to Python here . Have this code : I originally used raise `` Negative Number ! '' etc but quickly discovered that this was the old way of doing things and you have to call the Exception class . Now it 's working fine but how do I distinguish between my two exceptions ? For the code below it 's print... | Python , distinguishing custom exceptions |
Python : Given a list of regions on a line : I want to know which regions a point X belongs to : I know naively ( and my current implementation ) we can just search in O ( n ) , but a more dramatic use case with thousands of regions ( and thousands of look up points , really , is the motivator ) justifies investigating... | Optimized approach to finding which pairs of numbers another number falls between ? |
Python : In Python 2 , are all exceptions that can be raised required to inherit from Exception ? That is , is the following sufficient to catch any possible exception : or do I need something even more general like <code> try : code ( ) except Exception as e : pass try : code ( ) except : pass | Does ` try ... except Exception as e ` catch every possible exception ? |
Python : I read a cool article on how to avoid creating slow regular expressions . Generally speaking it looks like the longer and more explicit and regex is the faster it will complete . A greedy regex can be exponentially slower . I thought I would test this out by measuring the time it takes to complete a more compl... | Python Regex slower than expected |
Python : I have a string : I want to convert it to : I am trying this : but it returns : ( without the string operation done ) What is the possible reason .title ( ) is not working . ? How to use string operation on the captured group in python ? <code> str1 = `` abc = def '' str2 = `` abc = # Abc # '' re.sub ( `` ( \w... | String Operation on captured group in re Python |
Python : If I try the following code , I see that the normal block return value is not returned , but the finally block return value is : A more advanced example is to call a function in each return statement : In that situation , I can see that : In the normal block , the show function is evaluated ( but not return ) ... | Is it an error to return a value in a finally clause |
Python : Writing doctests for a method that abbreviates a dictionary by searching for a passed key word in the keys of the original dictionary , and returning the new , abbreviated dictionary . My docstring looks as follows : The function works , but when I run py.test 's doctest , the function fails the test as it ret... | Python : accept unicode strings as regular strings in doctests |
Python : I want to use different API keys for data scraping each time my program is run . For instance , I have the following 2 keys : and the following URL : When the program is run , I would like myUrl to be using apiKey1 . Once it is run again , I would then like it to use apiKey2 and so forth ... i.e : First Run : ... | Alternating between variables each run |
Python : So I have created a list for multiprocessing stuff ( in particular , it is multiprocessing.Pool ( ) .starmap ( ) ) and want to reduce its memory size . The list is the following : Its memory size calculated from sys.getsizeof ( lst1_1 ) is 317840928Seeing that the type of lst1 is int32 , I thought changing the... | Reducing the memory size of a list for multiprocessing.Pool.starmap ( ) |
Python : I 'm making a program that , in part , rolls four dice and subtracts the lowest dice from the outcome . The code I 'm using isThat 's the best I could come up with from my so-far limited coding ability . Is there a better way to make it organize the four dice in order of size , then add together the three high... | Is there a more efficient way to organize random outcomes by size in Python ? |
Python : I want to construct YYYY_WW information from dates ( where WW is a number of week ) . I am struggling with the years ' endings ( beginnings ) , where a part of a week can fall into the neighbouring year:2018_01 is obviously incorrect . Any hint for a simple workaround ? <code> import datetimeimport pandas as p... | python - Year-week combination for the end or beginning of a year |
Python : I 'm trying to round a pandas DatetimeIndex ( or Timestamp ) to the nearest minute , but I 'm having a problem with Timestamps of 30 seconds - some rounding up , some rounding down ( this seems to alternate ) .Any suggestions to fix this so that 30s always rounds up ? The top result looks fine , with 57m 30s r... | Pandas Timestamp rounds 30 seconds inconsistently |
Python : I have an old legacy Fortran code that is going to be called from Python.In this code , data arrays are computed by some algorithm . I have simplified it : let 's say we have 10 elements to proceed ( in the real application its more often 10e+6 than 10 ) : These arrays are then used as follows : What would be ... | What is a good way of mapping arrays in Python ? |
Python : I am looking for a way in python to make a dictionary of dictionaries based on the desired structure dynamically.I have the data bellow : I give the structure I want them to be like : and finally get the data in this format : This is the manual way that I thought for achieving this : Can you think of a way to ... | Get a decision tree in a dictionary |
Python : Dictionaries in python are supposed to have unique keys . Why are you allowed to do this ... Should n't this throw some sort of error ? <code> d = { ' a ' : ' b ' , ' a ' : ' c ' } | Why does python allow you to create dictionaries with duplicate keys |
Python : I have a tuple of Control values and I want to find the one with a matching name . Right now I use this : Can I do it simpler than this ? Perhaps something like : <code> listViewfor control in controls : if control.name == `` ListView '' : listView = control listView = controls.FirstOrDefault ( c = > c.name ==... | Is there a way to find an item in a tuple without using a for loop in Python ? |
Python : ( Sorry , could n't resist the pun ! ) I wonder why it does n't seem possible to translate : into this more readable expression , using dict comprehension : <code> dict ( [ ( str ( x ) , x ) if x % 2 else ( str ( x ) , x*10 ) for x in range ( 10 ) ] ) { str ( x ) : x if x % 2 else str ( x ) : x*10 for x in ran... | Python dict incomprehension |
Python : currently I am trying to calculate optical flows of moving objects . the objects in particular are the squares that are around the circular knobs : Here is the vanilla image I am trying to process : my concern is about the right bottom-most strip . The two squares are usually unable to be detected when I have ... | OpenCV : Detect squares in dark background |
Python : I am looking for a way to apply a function n items at the time along an axis . E.g.If I apply sum across the rows 2 items at a time I get : Which is the sum of 1st 2 rows and the last 2 rows.NB : I am dealing with much larger array and I have to apply the function to n items which I can be decided at runtime.T... | Apply function n items at a time along axis |
Python : Is there a function in Python to get the difference between two or more values in a list ? So , in those two lists : I need to calculate the difference between every value in list1 and list2.This gives negative values , but I want the subtraction between the values of the two lists only from highest value to l... | function of difference between value |
Python : Suppose I have one list which contains anagram strings . For example , And I want to construct a dictionary which contains element of that list as key and anagram strings of that element will be values of that key as a list , Also elements which will be added into list are not repeated as another key of that d... | How to add elements in list which is value of dictionary and those elements not be repeated as another keys of that dictionary ? |
Python : How does Python ( 2.6.4 , specifically ) determine list membership in general ? I 've run some tests to see what it does : Which yields : This tells me that Python is probably checking the object references , which makes sense . Is there something more definitive I can look at ? <code> def main ( ) : obj = fan... | Specifics of List Membership |
Python : I am trying to learn how classes work . I would like to create different classes with some shared elements and others not , but as far as I know I can create it from three different ways : Create a class with all the shared elements and then inherit this class and modify specific methods and attributes in the ... | Which strategy follow to create class ? |
Python : I have a sprite which shoots bullets . Sometimes bullets also shoot out of invisible shooters.The switch from opponent to shooter mid-program works but when I want the bullets to shoot in a certain way , with delays between each shot , the bullets seem to become a single line ( the purple thing in the image is... | `` Bullets '' shot from two Pygame sprites combine into a single long line |
Python : I have two three dimensional arrays , a and b , and want to find the 2D subarray of b with the elements where a had a minimum along the third axis , i.e.Is there a way I can get these values without the double loop ? I am aware of this answer : replace min value to another in numpy arraybut if I want this to w... | Find array corresponding to minimal values along an axis in another array |
Python : How can I stop Python from deleting a name binding , when that name isused for binding the exception that is caught ? When did this change inbehaviour come into Python ? I am writing code to run on both Python 2 and Python 3 : Notice that exc is explicitly bound before the exception handling , so Python knows ... | Name binding in ` except ` clause deleted after the clause |
Python : I came accross the following interview question and have no idea how to solve it : Given a pair , e.g cons ( 6,8 ) I am requested to return a and b separetely , e.g in this case 6 , 8 respectively.Meaning , for example , How can this be done ? <code> def cons ( a , b ) : def pair ( f ) : return f ( a , b ) ret... | How to open a closure in python ? |
Python : I am trying to get all < tr class= '' **colour blue** attr1 attr2 '' > from a page . The attrs are different each time , and some of the other sibling < tr > s have colour red , colour pink etc . classes.So I 'm looking for any other characters after colour blue in class to be included in the result . I 've tr... | What 's the equivalent of '* ' for Beautifulsoup - find_all ? |
Python : I have two tables that look like the followingandWhat 's the best way to take the first dataframe , lookup each parameter 's weight in the second dataframe and return a dataframe like the following ? What I was thinking was to write a function given the parameter , and value , subset table2 like the following ... | Using column header and values from one dataframe to find weights in another dataframe |
Python : I have the following dfHow can I remove lowercase letters from the Name column such that when looking at data [ 'Name ' ] , I have TOM , NICK , KRISH , JACK.I tried the following but no luck , <code> data = { 'Name ' : [ 'TOMy ' , 'NICKs ' , 'KRISHqws ' , 'JACKdpo ' ] , 'Age ' : [ 20 , 21 , 19 , 18 ] } data [ ... | Removing lower case letter in column of Pandas dataframe |
Python : I 'm trying to convert the values of a list using the map function but i am getting a strange result.gives : why does it not return [ ' 4 ' , '58 ' , ' 6 ' ] ? <code> s = input ( `` input some numbers : `` ) i = map ( int , s.split ( ) ) print ( i ) input some numbers : 4 58 6 < map object at 0x00000000031AE7B... | Trouble with map ( ) |
Python : How can I create a Python C extension wheel for MacOS that is backwards compatible ( MacOS 10.9+ ) using MacOS 10.15 ? This is what I have so far : Unfortunately , pip wheel generates a file myapp-0.0.1-cp37-cp37m-macosx_10_15_x86_64.whl , and unlike auditwheel on Linux , delocate-wheel does not modify the nam... | Create Python C extension using MacOS 10.15 ( Catalina ) that is backwards compatible ( MacOS10.9+ ) |
Python : Why the call to getslice does n't respect the stop I sent in , instead silently substituting 2^63 - 1 ? Does it mean that implementing __getslice__ for your own syntax will generally be unsafe with longs ? I can do whatever I need with __getitem__ anyway , I 'm just wondering why __getslice__ is apparently bro... | Slice endpoints invisibly truncated |
Python : Can you please explain why this happens in Python v3.8 ? Output:2 is within the range of the small integer caching . So why are there different objects with the same value ? <code> a=round ( 2.3 ) b=round ( 2.4 ) print ( a , b ) print ( type ( a ) , type ( b ) ) print ( a is b ) print ( id ( a ) ) print ( id (... | Why does n't small integer caching seem to work with int objects from the round ( ) function in Python 3 ? |
Python : I came across this expression , which I thought should evaluate to True but it doesn't.Above statement works as expected but when this : is executed , it evaluates to False.I tried searching for answers but could n't get a concrete one . Can anyone help me understand this behavior ? <code> > > s = 1 in range (... | Why does `` 1 in range ( 2 ) == True '' evaluate to False ? |
Python : I have a list of lists and I want to be able to refer to the 1st , 2nd , 3rd , etc . column in a list of lists . Here is my code for the list : I want to be able to say something like : I want to know what the python syntax would be for the stuff in parenthesis . <code> matrix = [ [ 0 , 0 , 0 , 5 , 0 , 0 , 0 ,... | How to look at only the 3rd value in all lists in a list |
Python : I found this kind of expression several times in a python program : It seems strange to me , and I think that it has no more sense than : Maybe I do n't know Python enough , and the expression is explained somewhere ? <code> if variable is not None : dothings ( variable ) if variable : dothings ( variable ) | Does this Python expression make sense ? |
Python : ProblemI have to compute many Fourier transforms . I would like to do these in parallel with my many cores . Note that I do n't want a parallel FFT algorithm , I just want to launch many embarrassingly parallel FFTs.I discover that , while my CPU usage goes up , my time to completion does not decrease.ExampleW... | Increased occupancy without speedup in FFT |
Python : This sounds like an easy question , but I find it surprisingly tricky to get right with good performance.The first algorithm I 've come up with is to draw points randomly , check from a set if it 's already been drawn , and draw it otherwise . This works fine if we are drawing few points but slows down catastr... | How to efficiently draw exactly N points on screen ? |
Python : I very often write code like : where I would like to write : using : Are there functor-creators like idx_f and attr_f in python , and are they of clearer when used than lambda 's ? <code> sorted ( some_dict.items ( ) , key=lambda x : x [ 1 ] ) sorted ( list_of_dicts , key=lambda x : x [ 'age ' ] ) map ( lambda... | Trivial functors |
Python : I understand that the pattern r ' ( [ a-z ] + ) \1+ ' is searching for a repeated multi character pattern in the search string but I do not understand why in case k2 answer is n't 'aaaaa ' ( 5 ' a ' ) : Python 3.6.1 <code> import rek1 = re.search ( r ' ( [ a-z ] + ) \1+ ' , 'aaaa ' ) k2 = re.search ( r ' ( [ a... | Regular expressions - different string the same match |
Python : What I did is obviously not something that one would want to do , rather , I was just testing out implementing __hash__ for a given class . I wanted to see if adding a phony 'hashable ' class to a dictionary , then changing it 's hash value would then result in it not being able to access it . My class looks l... | Class with changing __hash__ still works with dictionary access |
Python : I have the following code : Why does this code print the text Hello instead of raise an error ? <code> with open ( True , ' w ' ) as f : f.write ( 'Hello ' ) | Why does open ( True , ' w ' ) print the text like sys.stdout.write ? |
Python : I have some stats in a trie which is generated periodically . I want to generate flame graphs on the difference between two tries . How do I do that ? <code> t = pygtrie.StringTrie ( separator=os.path.sep ) for dirpath , unused_dirnames , filenames in os.walk ( ROOT_DIR ) : for filename in filenames : filename... | Construct flame graph from trie |
Python : I could do this in brute force , but I was hoping there was clever coding , or perhaps an existing function , or something I am not realising ... So some examples of numbers I want : The full permutation . Except with results that have ONLY six 1 's . Not more . Not less . 64 or 32 bits would be ideal . 16 bit... | How do I find all 32 bit binary numbers that have exactly six 1 and rest 0 |
Python : I 've inspected .__code__ objects for two functions I deemed different , but found to be identical , for a variety of expressions . If code objects are identical , as far as I understand , they compile to same bytecode , and are thus `` same '' functions.Table below is of things inserted before ; pass that mak... | Why is [ 0 ] a different function but 0 is n't ? |
Python : I 'm trying to implement a basic pipelined model using Graphcore 's PopART framework ( part of the Poplar API ) to speed up my model which is split over multiple processors.I 'm following their example code , but I notice the example does not use the pipelineStage ( ) call , which is used in some of their othe... | Difference between virtualGraph and pipelineStage Graphcore 's PopART/Poplar libraries |
Python : I have a list of coordinates : I have a string as follows : I want to replace intervals indicated in pairs in coordinates as start and end with character ' N'.The only way I can think of is the following : The desired output would be : where intervals , [ 1,5 ) , [ 10,15 ) and [ 25 , 35 ) are replaced with N i... | Replace a list of characters with indices in a string in python |
Python : I may break the code up for readability reasons . So ... into something likeHowever , the extra awaits mean that these are not strictly equivalentAnother concurrent task can run code between print ( 'top ' ) and print ( ' 1 ' ) , so makes race conditions a touch more likely for certain algorithms.There is ( pr... | Call a coroutine without yielding the event loop |
Python : Suppose I have the dict of a module ( via vars ( mod ) , or mod.__dict__ , or globals ( ) ) , e.g . : Given the dict d , how can I get back the module mod ? I.e . I want to write a function get_mod_from_dict ( d ) , which returns the module if the dict belongs to a module , or None : If get_mod_from_dict retur... | Get module instance given its vars dict |
Python : How can I make sure that the variables brk1_int_c , brk1_ext_c , brk2_int_c , brk2_ext_c within the parseTwoPoleBreakres get placed into the inputList instead of the brk1_int_c , brk1_ext_c , brk2_int_c , brk2_ext_c being called outside of the function ? I 'm having difficulty with my parseTwoPoleBreakers func... | Calling Parent Variables into List |
Python : Executing the script with the space after `` conv : '' the results is a `` newline '' as below : how remove \n ( new line ) ? removing the space character after conv : the script runs perfectly.results is : I 'd like have : <code> lines = lines.replace ( `` www . `` , '' conv : `` ) conv : yahoo.comconv : yaho... | remove \n after `` lines.replace '' |
Python : I have a simple little decorator , that caches results from function calls in a dict as a function attribute.I now want to add the possibility to empty the cache . So I change the dynamic_programming ( ) function like this : Now let 's assume I use this little thing to implement a Fibonacci number function : B... | Reassign a function attribute makes it 'unreachable ' |
Python : I have a 3D dimensional array.I would like to calculate the percentile rank of a particular value along axis = 0.E.g . if the value = 4 , the output is expected to be : where the 0.25 at [ 0 ] [ 0 ] is the percentile rank of 4 in [ 0 , 6 , 12 , 18 ] , etc.If the value = 2.5 , the output is expected to be : I w... | Calculate the percentile rank of a value in a multi-dimensional array along an axis |
Python : I am planning to implement C++-like constructor/destructor functionality to one of my Python classes using the handy with statement . I 've come accross this statement only for file IO up to now , but I thought it would be rather helpful for connection-based communication tasks as well , say sockets or databas... | What things to be aware of when using the with-statement for own classes ? |
Python : I have 3 objects that I am populating into a JSON file format . The objects come from an API which needs rolled out to access as such : Produces output like this : My desired output : As you can see , I need each nested dictionary enclosed in a list at each level and I need to add a key/value pair at each leve... | Nested lists of dictionaries |
Python : I have a .txt file with the following contents : I want to overwrite the file such that these are its new contents : Basically I want to turn the .txt file into a python dictionary so I can manipulate it . Are there built in libraries for this sort of task ? Here is my attempt : I 'm succeeding in getting the ... | Python : regex to make a python dictionary out of a sequence of words ? |
Python : Working in Python3 . Say you have a million beetles , and your task is to catalogue the size of their spots . So you will make a table , where each row is a beetle and the number in the row represent the size of spots ; Also , you decide to store this in a numpy array , for which you pad the lists with None ( ... | Reasonable way to have different versions of None ? |
Python : I want to merge two arrays in python in a special way . The entries with an odd index of my output array out shall be the coresponding entries of my first input array in0 . The entries with an even index in out shall be the coresponding entries of my second input array in1.in0 , in1 and out are all the same le... | Combine elements from two lists |
Python : I have a column with a series of timestamps in it . Originally I thought they are in Unix timestamps system so I used the following code to convert them to date time.however , it gave me odd results so I researched a bit more and found out the timestamps are basically using the .net epoch , which is midnight 0... | Convert epoch , which is midnight 01/01/0001 , to DateTime in pandas |
Python : This is my sample DataFrame . I want to apply groupby on column ' A ' , Apply rolling sum on column ' B ' based on the value of column ' C ' , means when A is 1 so window size should be 2 and instead of NaN I want the sum of remaining values regardless of window size . Currently my output is : code for above :... | How to pass dataframe column value as window size after df.groupby ? |
Python : If I have a dict for exampleHowever , I do n't know how many nested items are in this dict . Instead I have a list of keys like : What is an elegant way to set d [ ' a ' ] [ ' y ' ] [ ' z ' ] [ ' 1 ' ] = 'winner ' ? Here 's what I 've tried : <code> d = { ' a ' : { `` x '' : [ ] , `` y '' : { `` z '' : { `` 1 ... | How to set `` nth '' element of a nested python dict with given list location ? |
Python : I am using a Homebrew-installed Python on my Mac ( running OS X 10.13.1 ) , and of late , I ’ ve noticed that the interpreter takes a frustratingly long time to start up.In setting out to try to solve this problem , I did a simple check with time : … which revealed the egregiousness of the issue : 12 seconds !... | Python interpreter takes ~12 seconds to start up , all of which is spent in ` import pyexpat ` |
Python : I have a df , where the data looks like this : I want to fill in the blank cells in the Time variable according to the calendar year . So : I saw a post where pandas could be used to fill in numeric values , but since my variable is n't necessarily defined in a numeric way , I 'm not entirely sure how to apply... | How to fill in blank cells in df based on string in sequential row , Pandas |
Python : Hi I have about 16 20+ gb files on a server that I need to read specific entries from , I have the code working that reads the file in the correct order if I have one of the files saved on my computer Now I need to read the files from the server without downloading each file . I was looking into paramiko and w... | iterating through a large 20+ gb file from a server with python |
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