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(python2.1-ref.info)while statement

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

     while_stmt:     "while" expression ":" suite
                    ["else" ":" suite]

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.