Change elements in Python list with condition [duplicate]

Question

I have this list

x = [1,2,3,4,5,6]

I would like to convert elements greater than 3 as 0 so the list would become [1,2,3,0,0,0]

Here is my code

for i in range(len(x)): 
  if x[i] > 3:
    x = 0

I got this error message " 'int' object is not subscriptable". could somebody tell me what I did wrong

could somebody tell me what I did wrong: Look at your code and think about what x = 0 does. — Selcuk
– Selcuk, Commented Aug 23, 2021 at 3:12
After the first instance that x > 3 you set the list x = 0 from that point forward it is a number. You probably meant x[i] = 0 — Henry Ecker
– Henry Ecker ♦, Commented Aug 23, 2021 at 3:13

ThePyGuy · Accepted Answer · 2021-08-23 03:10:53Z

2

Problem with your current code is, you are assigning 0 directly to x, not to the item at a particular index, the same way you are comparing the value.

for i in range(len(x)): 
  if x[i] > 3:
    # x = 0
    x[i] = 0  #<---- assign value at the index i

Or, you can just use a list-comprehension, and take 0 if the value is greater than 3, else take the value

>>> [0 if i>3 else i for i in x]
[1, 2, 3, 0, 0, 0]

answered Aug 23, 2021 at 3:10

ThePyGuy

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