Find the similarity metric between two strings

How do I get the probability of a string being similar to another string in Python?

I want to get a decimal value like 0.9 (meaning 90%) etc. Preferably with standard Python and library.

e.g.

    similar("Apple","Appel") #would have a high prob.

    similar("Apple","Mango") #would have a lower prob.

There is a built in.

    from difflib import SequenceMatcher

    def similar(a, b):
        return SequenceMatcher(None, a, b).ratio()

Using it:

    >>> similar("Apple","Appel")
    0.8
    >>> similar("Apple","Mango")
    0.0

From: stackoverflow.com/q/17388213

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