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6.4 The `pass` statement

  `pass_stmt` | ::= | `"pass"`

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`pass` is a null operation -- when it is executed, nothing happens. It is useful as a placeholder when a statement is required syntactically, but no code needs to be executed, for example:

      def f(arg): pass    # a function that does nothing (yet)

      class C: pass       # a class with no methods (yet)