Why does changing one list change another - Python

0 votes

I have recently started learning python. I have the following code:

x = []
y = x
y.append(10)

The issue here is, I am appending the variable y but for some reason, variable x is also getting appended. Why is this happening? 

Jul 25, 2019 in Python by Aleesha
555 views

1 answer to this question.

0 votes
Hey @Aleesha, here when you write x=y, you're not creating a copy of x and assigning that to y. Instead, it creates a new variable y and a reference to the object x is passed. This means that there is only one object (the list), and both x and y refer to it. Hence changing y will change x also.
answered Jul 25, 2019 by Kanika

Related Questions In Python

0 votes
1 answer

Python join: why is it string.join(list) instead of list.join(string)?

950down voteaccepted It's because any iterable can be ...READ MORE

answered May 15, 2018 in Python by aryya
• 7,440 points
287 views
0 votes
1 answer

Python join: why is it string.join(list) instead of list.join(string)?

This is because join is a "string" ...READ MORE

answered Jul 30, 2018 in Python by Priyaj
• 58,140 points
303 views
+1 vote
1 answer

Why does x,y = zip(*zip(a,b)) work in Python?

I'm extremely new to Python so this ...READ MORE

answered Aug 23, 2018 in Python by Priyaj
• 58,140 points
604 views
0 votes
1 answer

How do I append one string to another in Python?

If you only have one reference to ...READ MORE

answered Oct 22, 2018 in Python by SDeb
• 13,300 points
207 views
0 votes
2 answers
+1 vote
2 answers

how can i count the items in a list?

Syntax :            list. count(value) Code: colors = ['red', 'green', ...READ MORE

answered Jul 7, 2019 in Python by Neha
• 330 points

edited Jul 8, 2019 by Kalgi 2,484 views
0 votes
1 answer
+5 votes
6 answers

Lowercase in Python

You can simply the built-in function in ...READ MORE

answered Apr 11, 2018 in Python by hemant
• 5,810 points
1,861 views
0 votes
4 answers

Is it possible to call one python script from another Python Script?

Try using os.system: os.system("script2.py 1") execfile is different because it is ...READ MORE

answered Dec 16, 2020 in Python by Gitika
• 65,970 points
32,545 views
0 votes
1 answer

How to write content of one file to another file in Python?

The following code snippet might solve your ...READ MORE

answered Aug 26, 2019 in Python by Neel
• 3,020 points
240 views