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Variables

variables

Named places in memory that hold values. Python variables are dynamically typed — the type comes from the value, not from a declaration.

Syntax

имя_переменной = значение

A name is a label attached to an object, not a box holding a value: b = a copies nothing, and if the object is mutable (a list, a dict), a change made through one name is visible through the other. Reading a name that was never assigned raises NameError — not None, not zero. In multiple assignment the number of names on the left must match the number of values on the right, otherwise you get ValueError.

Examples

x = 10  # целое число
pi = 3.14  # float
greeting = "Привет"  # строка
a, b, c = 1, 2, 3  # множественное присваивание
a, b = b, a  # обмен значений без temp
x += 5  # x = x + 5 → 15 (составное присваивание)
del x  # удаление переменной

See also

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