parameters: (self, f)
return_statement: return
docstring: Called before writing the mailbox to file f.
docstring_summary: Called before writing the mailbox to file f.
docstring_tokens: Called before writing the mailbox to file f .
function: def _pre_mailbox_hook(self, f):
          """Called before writing the mailbox to file f."""
          return
function_tokens: def _pre_mailbox_hook ( self , f ) : return