Can the comments produce errors in python?

[snippsat]

It should work fine everywhere if remove that \0 and have normal characters as replace.
The error happens before comments part.
Tested VS Code,PyScripter,cmder,IDLE okay.

import re

string1 = 'Agent Cheesecake was a double agent.'
agent_names_regex = re.compile(r'Agent (\w)\w*')
mo_0 = agent_names_regex.sub(r'***', string1)
print(f"This is string1 '{string1}' with *** after censorship: {mo_0}")

##Output:
##
# This is string1 'Agent Cheesecake was a double agent.' with *** after censorship: *** was a double agent.
##
##>>>