OR operation not working in removing string part

November 30, 2022

I’ve been trying to parse a string and to get rid of parts of the string using the remove() function. In order to find the part which I wanted to remove I used an OR operator. However, it does not produce the outcome I expected. Can you help me?

My code looks like this:

import numpy as np

x = '-1,0;1,0;0,-1;0,+1'

x = x.split(';')

for i in x:
    if ('+' in i) or ('-' in i):
        x.remove(i)
    else:
        continue
    
x = ';'.join(x)    
print(x)

The outcome I expect is:

[1,0]

Instead the outcome is:

[1,0;0,+1]

>Solution :

Modifying lists that you are currently itterating over is not a good approch. Instead take a new list and append values in else.

x = '-1,0;1,0;0,-1;0,+1'

x = x.split(';')

new = []

for i in x:
    if ('+' in i) or ('-' in i):
        pass
    else:
        new.append(i)
    
x = ';'.join(new)    
print(x)

Gives #