How do I pass a list of arguments to a Python script using argparse?

How can I pass a list as a command-line argument with argparse?

Command-Line Argument Passing in argparse

When seeking to furnish argparse with a list of arguments, it's crucial to understand that type=list should be avoided. Instead, employ either the nargs option or action='append'.

The nargs Option

Usage:

Example:

<code class="python">python arg.py -l 1234 2345 3456 4567</code>

Interpretation:

• nargs=' ' indicates the acceptance of one or more arguments.
• nargs='*' accepts zero or more arguments.
• nargs='?' accepts zero or one argument.
• An integer value for nargs specifies the precise number of arguments to accept.

The append Action

Usage:

Example:

<code class="python">python arg.py --append-action 1234 --append-action 2345 --append-action 3456 --append-action 4567</code>

Interpretation:

• action='append' requires specifying the flag multiple times to construct a list.

Input Handling in argparse

• argparse can interpret negative numbers as expected.
• Quotes should not be used on the command line when providing lists to argparse.

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