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enumerate(sequence, [start=0])

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

i = 0
seq = ['one', 'two', 'three']
for element in seq:
    print(i, seq[i])
    i += 1

0 one
1 two
2 three

seq = ['one', 'two', 'three']
for i, element in enumerate(seq):
    print(i, element)

0 one
1 two
2 three