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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]`

  Download entire grammar as text.

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.