all Python 3Conditionalsconstruct

Nested conditions

branching

An if inside another if. It lets you test combinations of conditions. Use it carefully — deep nesting hurts readability.

Syntax

if условие1:
    if условие2:
        блок

Nesting is often a hint to simplify: two ifs in a row without an else collapse into one via and, and deep branches flatten out with an early return or continue that strips the extra levels. This is a case where flat code almost always reads better than nested.

Examples

x = 15
if x > 0:
    if x % 2 == 0:
        print("положительное чётное")
    else:
        print("положительное нечётное")  # → положительное нечётное
age, has_ticket = 20, True
if age >= 18:
    if has_ticket:
        print("вход разрешён")  # → вход разрешён
n = 100
if n >= 10:
    if n <= 999:
        print("двух/трёхзначное")  # → двух/трёхзначное
a, b = 5, 10
if a > 0:
    if b > 0:
        if a + b > 12:
            print("сумма > 12")  # → сумма > 12

See also

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