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enumerate(sequence, start=0)

Return an enumerate object. sequence must be a sequence, an iterator, or some other object which supports
iteration. The next() method of the iterator returned by enumerate() returns a tuple containing a
count (from start which defaults to 0) and the values obtained from iterating over sequence:

>>> seasons = ['Spring', 'Summer', 'Fall', 'Winter']>>> list(enumerate(seasons))[(0, 'Spring'), (1, 'Summer'), (2, 'Fall'), (3, 'Winter')]>>> list(enumerate(seasons, start=1))[(1, 'Spring'), (2, 'Summer'), (3, 'Fall'), (4, 'Winter')]

Equivalent to:

def enumerate(sequence, start=0):    n = start    for elem in sequence:        yield n, elem        n += 1

New in version 2.3.
Changed in version 2.6: The start parameter was added.