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7.2 The `while` statement

The `while` statement is used for repeated execution as long as an expression is true:

  while_stmt | ::= | "while" expression ":" suite
  |  | `["else" ":" suite]`

  Download entire grammar as text.

This repeatedly tests the expression and, if it is true, executes the first suite; if the expression is false (which may be the first time it is tested) the suite of the `else` clause, if present, is executed and the loop terminates.

A `break` statement executed in the first suite terminates the loop without executing the `else` clause's suite. A `continue` statement executed in the first suite skips the rest of the suite and goes back to testing the expression.