Detailed explanation of python command line parameters

In Python, parameters can be passed to the script through the command line. These parameters can be used inside scripts to perform different actions based on different inputs. Detailed explanation of Python command line parameters: 1. Positional parameters: parameters passed to the script in order on the command line. They can be accessed through position inside the script; 2. Command line options: parameters starting with - or -, usually Used to specify specific options or flags for the script; 3. Pass parameter values: Pass parameter values ​​through the command line.

The operating system for this tutorial: Windows 10 system, Python version 3.11.4, Dell G3 computer.

In Python, parameters can be passed to the script through the command line. These parameters can be used inside scripts to perform different actions based on different inputs. The following is a detailed explanation of Python command line parameters:

1. Positional parameters

Positional parameters refer to parameters passed to the script in order on the command line. They can be passed within the script via position Come visit.

For example, assuming there is a script called script.py, positional parameters can be passed in the following way:

python script.py arg1 arg2 arg3

In script.py, these positional parameters can be accessed through sys.argv , sys.argv[0] is the name of the script, sys.argv[1], sys.argv[2], etc. are positional parameters.

2. Command line options

Command line options refer to parameters starting with - or --, which are usually used to specify specific options or flags of the script.

The argparse module is usually used in Python to parse command line options, for example:

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("--verbose", help="increase output verbosity", action="store_true")
args = parser.parse_args()
if args.verbose:
    print("Verbosity turned on")

3. Pass parameter values

In addition to positional parameters and command line options, you can also pass Parameter values ​​are passed on the command line, for example:

python script.py --name John --age 30

In a script, these parameter values ​​can be parsed and accessed using argparse or other methods.

In short, command line parameters in Python can be passed through positional parameters, command line options and parameter values. These parameters can be easily parsed and processed using tools such as sys.argv and argparse, so that the script can perform different operations based on different inputs.

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