Pass data as a string to argparse in Python: unrecognized argument

Question

I am trying to parse date as an argument in Python with argparse:

def parsing(parser):
    parser.add_argument("--b", type=str)
    parser.add_argument("--e", type=str)
    return parser

parser = argparse.ArgumentParser()
parser = parsing(parser)
args = parser.parse_args()

I'm trying to execute it with:

python file.py –-b 20100101 –-e 20200120

But I am getting a "unrecognized argument" error. I have also tried removing the type=str, but I get the same error.

C:\Users\user\miniconda3\lib\site-packages\numpy_distributor_init.py:30: UserWarning: loaded more than 1 DLL from .libs: 
C:\Users\user\miniconda3\lib\site-packages\numpy\.libs\libopenblas.PYQHXLVVQ7VESDPUVUADXEVJOBGHJPAY.gfortran-win_amd64.dll 

C:\Users\user\miniconda3\lib\site-packages\numpy\.libs\libopenblas.WCDJNK7YVMPZQ2ME2ZZHJJRJ3JIKNDB7.gfortran-win_amd64.dll warnings.warn("loaded more than 1 DLL from .libs:" usage: file.py [-h] [--b B] [--e E] file.py: error: unrecognized arguments: –-b 20100101 –-e 20200120

C:\Users\user\miniconda3\lib\site-packages\numpy_distributor_init.py:30: UserWarning: loaded more than 1 DLL from .libs: C:\Users\user\miniconda3\lib\site-packages\numpy\.libs\libopenblas.PYQHXLVVQ7VESDPUVUADXEVJOBGHJPAY.gfortran-win_amd64.dll C:\Users\user\miniconda3\lib\site-packages\numpy\.libs\libopenblas.WCDJNK7YVMPZQ2ME2ZZHJJRJ3JIKNDB7.gfortran-win_amd64.dll warnings.warn("loaded more than 1 DLL from .libs:" usage: file.py [-h] [--b B] [--e E] file.py: error: unrecognized arguments: –-b 20100101 –-e 20200120 — cc88
– cc88, Commented Mar 16, 2021 at 5:57
Is that EXACTLY how you typed this? Because you would get that error if you passed those arguments as one string: python file.py "--b 20100101 --e 20200120" — Tim Roberts
– Tim Roberts, Commented Mar 16, 2021 at 6:04
The difference between the two kinds of dash is most obvious in your comments as displayed on my tablet. With other fonts there's just a slight difference in character length. — hpaulj
– hpaulj, Commented Mar 16, 2021 at 19:34

soumith · Accepted Answer · 2021-03-16 06:05:06Z

3

The error is in this line.

python file.py –-b 20100101 –-e 20200120

one of the '-' is a different character.

python file.py --b 20100101 --e 20200120

This works.

answered Mar 16, 2021 at 6:05

soumith

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1 Comment

Tim Roberts Over a year ago

Good eye, by the way.

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