Linked list implementation in python issue Question: I have been trying to implement a linked-list in python.Any call of a variable inside a function in Python is by default call by reference.I have this code: For the list_node: class list_node: def __init__(self,obj,next_listnode): self.obj = obj self.next_listnode = next_listnode For the linked_list: class linked_list: def __init__(self,list_node): …
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 …
How do I pass large numpy arrays between python subprocesses without saving to disk? Question: Is there a good way to pass a large chunk of data between two python subprocesses without using the disk? Here’s a cartoon example of what I’m hoping to accomplish: import sys, subprocess, numpy cmdString = “”” import sys, numpy …
How do I pass a variable by reference? Question: Are parameters passed by reference or by value? How do I pass by reference so that the code below outputs ‘Changed’ instead of ‘Original’? class PassByReference: def __init__(self): self.variable = ‘Original’ self.change(self.variable) print(self.variable) def change(self, var): var = ‘Changed’ See also: Why can a function modify …
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 …
