How does python replace string exactly works?

Answer 1

From the link posted by @Gideon:

string.replace(s, old, new[, maxreplace])

> s: The string to search and replace from.
> old: The old sub-string you wish to replace.
> new: The new sub-string you wish to put in-place of the old one.
> maxreplace: The maximum number of times you wish to replace the sub-string.

Answer 2

Try those methods:
http://pythoncentral.io/pythons-string-replace-method-replacing-JUMP_LINK__&&__python__&&__JUMP_LINK-strings/