[Python] argparse make python Flask connection failed [closed]

I run a server by Python Flask module also use ngrok to connenct another ip address. I wrote a bash script for passing some access tokens and use argparse lib to parse the arguments in my python script.

#<run.sh>
TOKEN1="..."
TOKEN2="..."
python server.py --access_token "$TOKEN1" --secret_token "$TOKEN2"


#<server.py>
parser = argparse.ArgumentParser(...)
parser.add_argument("--access_token",...)
parser.add_argument("--secret_token",...)
args = parser.parse_args() #-->this line
...



the line args = parser.parse_args() cause connection failed, but after remove it, the connection to ngrok become success.

I don't understand why, does argparse action have conflict with the process?

Thanks!

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