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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 5.10 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.