How to pass a matrix as an argument without changing its original values in Python Question: I am trying to pass a matrix (list of lists) as an argument to a function. I want to keep the original matrix values intact. How can I implement this in python? I have tried to copy the matrix …
python pandas dataframe, is it pass-by-value or pass-by-reference Question: If I pass a dataframe to a function and modify it inside the function, is it pass-by-value or pass-by-reference? I run the following code a = pd.DataFrame({‘a’:[1,2], ‘b’:[3,4]}) def letgo(df): df = df.drop(‘b’,axis=1) letgo(a) the value of a does not change after the function call. Does …
Passing an integer by reference in Python Question: How can I pass an integer by reference in Python? I want to modify the value of a variable that I am passing to the function. I have read that everything in Python is pass by value, but there has to be an easy trick. For example, …
Python : When is a variable passed by reference and when by value? Question: My code : locs = [ [1], [2] ] for loc in locs: loc = [] print locs # prints => [ [1], [2] ] Why is loc not reference of elements of locs ? Python : Everything is passed as …
Emulating pass-by-value behaviour in python Question: I would like to emulate the pass-by-value behaviour in python. In other words, I would like to make absolutely sure that the function I write do not modify user supplied data. One possible way is to use deep copy: from copy import deepcopy def f(data): data = deepcopy(data) #do …
Passing values in Python Question: When you pass a collection like list, array to another function in python, does it make a copy of it, or is it just a pointer? Asked By: Joan Venge || Source Answers: The object is passed. Not a copy, but a reference to the underlying object. Answered By: S.Lott …
