BASH: Single-Quotes inside a Single-Quoted String

In bash, to escape some characters for the command-line arguments properly, you can use single quotes. E.g.,

$ file 'Some # Weird File Name.odt'

But how about the single quote characters? There are several methods. I found the following ways most convenient.

(1) Replace ' with '\''

Break out of the quoted string, and escape the single quote alone.

 $ file 'My wife'\''s file.txt'

(2) Replace ' with '"'"'

Same idea, but different way of escaping the single quote.

$ file 'My wife'"'"'s file.txt'

So, in Python, you can use:

s = string.replace("'", "'\"'\"'")

or in PHP,

s = str_replace("'", "'\"'\"'", string);