How to count the number of words in a sentence, ignoring numbers, punctuation and whitespace?

by

str.split() without any arguments splits on runs of whitespace characters:

>>> s="I am having a very nice day."
>>> 
>>> len(s.split())
7

From the linked documentation:

If sep is not specified or is None, a different splitting algorithm is applied: runs of consecutive whitespace are regarded as a single separator, and the result will contain no empty strings at the start or end if the string has leading or trailing whitespace.

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