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I am trying to use my program with command line option. Here is my code:
import argparse def main(): parser = argparse.ArgumentParser() parser.add_argument("-u","--upgrade", help="fully automatized upgrade") args = parser.parse_args() if args.upgrade: print "Starting with upgrade procedure" main() When I try to run my program from terminal (python script.py -u), I expect to get the message Starting with upgrade procedure, but instead I get the error message unrecognized arguments -u.
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Optional Arguments To add an optional argument, simply omit the required parameter in add_argument() . args = parser. parse_args()if args.
argparse — parse the arguments. Using argparse is how you let the user of your program provide values for variables at runtime. It's a means of communication between the writer of a program and the user. That user might be your future self.
The argparse module provides a convenient interface to handle command-line arguments. It displays the generic usage of the program, help, and errors. The parse_args() function of the ArgumentParser class parses arguments and adds value as an attribute dest of the object.
The error you are getting is because -u is expecting a some value after it. If you use python script.py -h you will find it in usage statement saying [-u UPGRADE].
If you want to use it as boolean or flag (true if -u is used), add an additional parameter action:
parser.add_argument("-u","--upgrade", help="fully automatized upgrade", action="store_true") action - The basic type of action to be taken when this argument is encountered at the command line
With action="store_true", if the option -u is specified, the value True is assigned to args.upgrade. Not specifying it implies False.
Source: Python argparse documentation
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