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An alternative to passing a Formatter instance to the parser is to use a wrapper function. `HelpFormatter.__init__` takes several keyword args. '_get_formatter' does not use those. However we could define:
 def format_wrapper(**kwargs):
 # class 'factory' used to give extra parameters
 def fnc(prog):
 cls = argparse.HelpFormatter
 return cls(prog, **kwargs)
 return fnc
and use that to set the 'width' of the formatter object.
 parser = argparse.ArgumentParser( formatter_class = format_wrapper(width=40))