[Python] String pattern substitution in Python

I have a situation where I would like to rename a string as follows:

1. Say I have a string x = "foo$"
2. I want to rename this string as "foo\$"

Unfortunately when I do this: x.replace("$", "\$") The new string becomes foo\\$ I need the literal to be recognized as a part of the pattern. I tried x.replace("$", "\\\$") but this gave the same result. How to fix this?

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