Linked Questions
12 questions linked to/from When is a variable passed by reference and when by value?
3359
votes
44
answers
2.2m
views
How do I pass a variable by reference?
I wrote this class for testing:
class PassByReference:
def __init__(self):
self.variable = 'Original'
self.change(self.variable)
print(self.variable)
def change(self, ...
- 50.1k
0
votes
3
answers
182
views
Lists as values in a dictionary Python [duplicate]
ddic = {'a': 10,'b': 23,'c': [0, 1, 2]}
n2 = ddic['c']
n2[-2] = 1000.
ddic
{'a': 10, 'b': 23, 'c': [0, 1000.0, 2]}
Why changing the list at which n2 is pointing, changes also the list of dict ddic, ...
0
votes
1
answer
95
views
Why is list of Dataframes not being assigned in Python? [duplicate]
I attached an empty list of Dataframes into a variable. I used it in a for loop along with a list of columns so that I can transpose the columns into the index.
Then reassigned it back into the ...
- 25
0
votes
0
answers
57
views
Why different reference is created for int object when passed to function in python? [duplicate]
As per my knowledge the Python interpreter creates references from 0 to 256 for int objects, at the start itself. Here I got output 3,[44,2,3], for the list I understood, but why did the same thing ...
user9121250
6
votes
1
answer
16k
views
Is list pass by value or by reference? [duplicate]
Consider the following code, at first glance it does the same thing, but the result is different, sometimes it seems list is pass by value, sometimes list seems pass by reference:
lst = [1, 2]
def f(...
- 4,904
5
votes
4
answers
6k
views
Rotation of the numbers-python
To find the rotations of a number I wrote a code like
def rotation(N):
A=[]
for i in range(len(N)):
y=N.pop(0)
N.append(y)
A.append(N)
return A
K=[1,9,7]
r=...
- 127
10
votes
2
answers
228
views
References to mutables (e.g., lists) as values in Python dictionaries - what is best practice?
It is possible to map a dictionary key to a value that is a reference to a
mutable object, such as a list. Such a list object can be changed by invoking
a list method on the reference, and the ...
- 693
0
votes
4
answers
109
views
Python Data Structure: Difference between two types of for-loop in python?
I was thinking this question should be asked on SO, but I was not able to find it somehow(Let me know in the comment section if there was one, i will delete this post)
It has came to my attention ...
- 889
1
vote
2
answers
359
views
My minimax algorithm for Tic Tac Toe in Python is showing maximum recursion error
I am trying to write the code for minimax algorithm for tic tac toe in python all by myself, I have wrote the code but whenever the function is getting called it is showing a "maximum recursion depth ...
- 23
-1
votes
1
answer
149
views
Are Python's dictionary view objects an exception to its assignment by value nature
As per this question on Stack Overflow, assignments in Python are always by value, hence you cannot change the original source. For example (from the same question),
locs = [ [1], [2] ]
for loc in ...
- 8,378
3
votes
2
answers
70
views
Function in Python Setting Global Variables (without intent)
I don't know if this is a problem that others get, but I have code in python that goes like this:
def makemove(board,move,val):
new=board
new[move[0]][move[1]]=val
return new
My problem ...
- 33
0
votes
1
answer
124
views
Why does assignment of pd.DataFrame.sort_values() not work inside loop?
import numpy as np
import pandas as pd
test_data = pd.DataFrame(
dict(
value=np.random.rand(9) - 0.5,
group=np.repeat(np.arange(3), 3),
time_idx=np.tile(np.arange(3), 3),
...
- 3