PYTHON3 how to remove characters from string code example

Example 1: take off character in python string

s = 'abc12321cba'

print(s.replace('a', ''))

Example 2: delete certain characters from a string python

for char in line:
    if char in " ?.!/;:":
        line.replace(char,'')

Example 3: remove a part of a string python

url = 'abcdc.com'
print(url.replace('.com',''))