Q. What is a string slice? How is it useful?
Answer =
A sub-part or a slice of a string, say s, can be obtained using s [n: m] where n and m are integers.
Python returns all the characters at indices n, n+1, n + 2 ... m - 1
For example :-
>>> 'Path Walla' [1:4]
>>> 'ath'
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