I think I posted this somewhere else in this thread, or the previous thread.
argparse can handle negative numbers, but only of one of the built-in primitive
types. See example below:
```
import re, argparse
class meters(float):
def __new__(cls, x):
return super().__new__(cls, float(re.sub(r'm','',x)))
parser = argparse.ArgumentParser()
parser.add_argument("-l", "--length", dest='length', type=meters)
# _StoreAction(option_strings=['-l', '--length'], dest='length', nargs=None,
const=None, default=None, type=<class '__main__.meters'>, choices=None,
help=None, metavar=None)
meters("12")
#12.0
meters("12m")
#12.0
parser.parse_args("-l -12".split())
#Namespace(length=-12.0)
parser.parse_args("-l -12m".split())
#usage: [-h] [-l LENGTH]
#: error: argument -l/--length: expected one argument
```
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