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(python2.1-ref.info)pass statement

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The `pass' statement
====================

     pass_stmt:      "pass"

`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)