Manual de referencia de Python

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7.1 The if statement

The if statement is used for conditional execution:

if_stmt:        "if" expression ":" suite
               ("elif" expression ":" suite)*
               ["else" ":" suite]

It selects exactly one of the suites by evaluating the expressions one by one until one is found to be true (see section for the definition of true and false); then that suite is executed (and no other part of the if statement is executed or evaluated). If all expressions are false, the suite of the else clause, if present, is executed.

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Manual de referencia de Python

Anterior: 7. Compound statements Niv. superior: 7. Compound statements Siguiente: 7.2 The while statement