There is so much more you can do with arguments to your python scripts here are a few more ideas.
This sample below outlines a couple new things, positional arguments, app description and boolean switches to simply enable or disable features.
import argparse
# Create the parser and include an app description for it when you open the script with -h for help
parser = argparse.ArgumentParser(description='Your app description')
# Add arguments
parser.add_argument('pos_arg', type=int, help='A required integer positional argument')
parser.add_argument('--opt_arg', type=int, default=10, help='An optional integer argument')
parser.add_argument('--switch', action='store_true', help='A boolean switch')
# Parse the arguments
args = parser.parse_args()
# Access the values
print(args.pos_arg)
print(args.opt_arg)
print(args.switch)
Here is a way you can then also use specific validation for the types on your arguments. Like setting a range for your input values that you allow
import argparse
def ranged_num(lowest=-1, highest=1):
"""Check a numeric is in expected range."""
def type_func(a_value):
a_value = int(a_value) # or "float"; you could also have error handling here
if not (a_value >= lowest and a_value <= highest): # I'd rewrite this to an "or"
raise argparse.ArgumentTypeError("Not in range.")
return a_value
return type_func
parser = argparse.ArgumentParser()
parser.add_argument('num', type=ranged_num(), help='A number in range [-1,1]')
args = parser.parse_args()
print(args.num)
Actually you can add more than just a description, also a program name and footer in the help.
parser = argparse.ArgumentParser(
prog='ProgramName',
description='What the program does',
epilog='Text at the bottom of help')
Python will automatically generate your -h help for you based on all these arguments you've setup. NICE!
python prog.py -h
usage: prog.py [-h] [--sum] N [N ...]
Process some integers.
positional arguments:
N an integer for the accumulator
options:
-h, --help show this help message and exit
--sum sum the integers (default: find the max)
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