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Is it possible to use a regex expression for parsing an argument? For example, I want to accept an argument if only it is a 32 length hex (i.e. matches /[a-f0-9A-F]{32}/)
I tried
p.add_argument('hex', type=str, nargs="[a-f0-9A-F]{32}")
without success
396
To add your arguments, use parser. add_argument() . Some important parameters to note for this method are name , type , and required . The name is exactly what it sounds like — the name of the command line field.
>>> parser = argparse. ArgumentParser(description='Process some integers. ') The ArgumentParser object will hold all the information necessary to parse the command line into Python data types.
Metavar: It provides a different name for optional argument in help messages.
The type keyword argument can take any callable that accepts a single string argument and returns the converted value. If the callable raises argparse.ArgumentTypeError, TypeError, or ValueError, the exception is caught and a nicely formatted error message is displayed.
import argparse
import re
from uuid import uuid4
def my_regex_type(arg_value, pat=re.compile(r"^[a-f0-9A-F]{32}$")):
if not pat.match(arg_value):
raise argparse.ArgumentTypeError("invalid value")
return arg_value
parser = argparse.ArgumentParser()
parser.add_argument('hex', type=my_regex_type)
args = parser.parse_args([uuid4().hex])
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