Two ways to replace python strings

Python string substitution is a common problem encountered when python manipulates strings. Here is a brief introduction to the method of string substitution.

Python string substitution can be implemented in two ways:
One is using the string itself.
Replace the string with regularness

Here's an example:
A = 'hello word'
Replace word in string a with python

1. Use the replace method of the string itself

a.replace('word','python')

The output is hello python

2. Complete the substitution with regular expressions:

import re

strinfo = re.compile('word')

b = strinfo.sub('python',a)

print b

The output is also hello python

As for which method to use, depends on your own choice.