loop

Get tuples in a loop

When the data acquired by the loop is a tuple, multiple variables can be defined to acquire the tuple.

a = [(0, 1), (2, 3), (4, 5)]

for b, c in a:
    print(b, c)

Execution result

0 1 2 3 4 5

You can use the reversed () method to sort in reverse order and loop as usual.

d = [0, 1, 2, 3, 4]
for i in reversed(d):
    print(i)

Execution result

4 3 2 1 0

By using the ʻenumerate ()` method, you can get the index of the data and the iterator of the tuple consisting of the data specified by the index.

e = ['apple', 'orange', 'melon', 'lemon']

for i, j in enumerate(e):
    print(i, j)

Execution result

0 apple 1 orange 2 melon 3 lemon

The zip () method returns an iterator consisting of tuples of values at the same index from multiple arguments.

e = ['apple', 'orange', 'melon', 'lemon']
f = ['label1', 'label2', 'label3', 'label4']

for i, j in zip(f, e):
    print(i, j)

Execution result

label1 apple label2 orange label3 melon label4 lemon