Python args

argparse

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("square", type=int,
                    help="display a square of a given number")
parser.add_argument("-v", "--verbose", action="store_true",
                    help="increase output verbosity")
args = parser.parse_args()
answer = args.square**2
if args.verbose:
    print(f"the square of {args.square} equals {answer}")
else:
    print(answer)

>> python prog.py
usage: prog.py [-h] [-v] square
prog.py: error: the following arguments are required: square

>> python prog.py 4
16

>> python prog.py 4 --verbose
the square of 4 equals 16

>> python prog.py --verbose 4
the square of 4 equals 16

!cat 9_argparse_example.py

import argparse
from datetime import datetime

def reformat_date(date_string):
    date_object = datetime.strptime(date_string, '%d/%m/%Y')
    return date_object.strftime('%Y-%m-%dT%H:%M:%SZ')

def main(start, end):
    if start != None:
        print("Argument 1:", reformat_date(start))
    if end != None:
        print("Argument 2:", reformat_date(end))

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="""Create models for users
    Ex. python test.py -s 19/03/2024 -e 19/07/2024""")
    parser.add_argument("-s", "--start_date", type=str, help="Start Date ex. '19/03/2024'")
    parser.add_argument("-e", "--end_date", type=str, help="End Date ex. '19/07/2024'")
    args = parser.parse_args()
    main(args.start_date, args.end_date)

!python 9_argparse_example.py -h

usage: 9_argparse_example.py [-h] [-s START_DATE] [-e END_DATE]

Create models for users Ex. python test.py -s 19/03/2024 -e 19/07/2024

options:
  -h, --help            show this help message and exit
  -s START_DATE, --start_date START_DATE
                        Start Date ex. '19/03/2024'
  -e END_DATE, --end_date END_DATE
                        End Date ex. '19/07/2024'

!python 9_argparse_example.py -s 01/01/2023 -e 01/01/2024

Argument 1: 2023-01-01T00:00:00Z
Argument 2: 2024-01-01T00:00:00Z

!cat 9_sys_example.py

import sys
 
# total arguments
n = len(sys.argv)
print("Total arguments passed:", n)
 
# Arguments passed
print("\nName of Python script:", sys.argv[0])
 
print("\nArguments passed:", end = " ")
for i in range(1, n):
    print(sys.argv[i], end = " ")
     
# Addition of numbers
Sum = 0
# Using argparse module
for i in range(1, n):
    Sum += int(sys.argv[i])
     
print("\n\nResult:", Sum)

!python 9_sys_example.py 1 2

Total arguments passed: 3

Name of Python script: 9_sys_example.py

Arguments passed: 1 2 

Result: 3

a = []

a[1] = 1

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
Cell In[1], line 1
----> 1 a[1] = 1

NameError: name 'a' is not defined

a

[1, 1, 3]