Replace a string located between

by 
import re
Variable = "The sun shines, that's fine [not, for, everyone] and if it rains, it Will Be better."
Variable1 = re.sub("\[[^]]*\]", lambda x:x.group(0).replace(',',''), Variable)

First you need to find the parts of the string that need to be rewritten (you do this with re.sub). Then you rewrite that parts.

The function var1 = re.sub("re", fun, var) means: find all substrings in te variable var that conform to "re"; process them with the function fun; return the result; the result will be saved to the var1 variable.

The regular expression “[[^]]*]” means: find substrings that start with [ (\[ in re), contain everything except ] ([^]]* in re) and end with ] (\] in re).

For every found occurrence run a function that convert this occurrence to something new.
The function is:

lambda x: group(0).replace(',', '')

That means: take the string that found (group(0)), replace ',' with '' (remove , in other words) and return the result.

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