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The required format is '--option[=[arg]]' or 'option=arg'. More...
The required format is '--option[=[arg]]' or 'option=arg'.
In the former case the optional argument is interpreted as
a string (only '--option' sets the value to True, '--option='
sets it to the empty string), in the latter case the argument
is evaluated as a python expression.
Returns (None, None) for non-option argument