替换匹配的单词python

Question

I have this codition:

if "Exit" in name:
   replace_name = name.replace("Exit","`Exit`")
   name = replace_name

and it should replace Exit with 'Exit' but if I have another word like exited, it also replaces it 'Exit'. I only want it to replace the exact one "Exit" not exited. what is the best way to overcome this issue?

Thanks.

Answer 1

You can use a regular expression with word boundary ( \\b ) characters. Also, no need for the if check; if the word is not in the string, then nothing is replaced.

>>> import re
>>> s = "he exited through the exit"
>>> re.sub(r"\bexit\b", "'exit'", s)
"he exited through the 'exit'"

You could also use flags to make the match case insensitive, or use a callback function for determining the replacement

>>> s = "he exited through the Exit"
>>> re.sub(r"\b(exit)\b", lambda m: "'%s'"%m.group(1).upper(), s, flags=re.I)
"he exited through the 'EXIT'"

Answer 2

Use re for this.

import re
replaced_name=re.sub(r"\bExit\b","`Exit`",name)

Answer 3

Input:

name = ['dr.doom','spiderman',"Exit", 'exited']

if "Exit" in name:
    index = name.index("Exit")
    name.pop(index)
    name.insert(index, "'Exit'")

print(name)

Output:

['dr.doom', 'spinderman', "'Exit'", 'exited']

Answer 4

I should've wrote it this way:

if name == "Exit":
   replace_name = name.replace("Exit","`Exit`")
   name = replace_name