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PassArguementsPython.md

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Pass arguements methods in Python

🟢 Pass arguements to a function

  • Pass single varible to a function
def pass_arg_func(a,b):
    result = a+b
    return result

👉 in command line: print(pass_arg_func(39,100))

  • Pass an array to a function
def pass_arr_func(list):
    sum = 0
    for n in list:
        sum += n
    return sum

👉 in command line: print(pass_arr_func([10,20,30]))

🟢 Pass arguments to a script

  • Using sys library
import sys

def pass_arg_scri():
    print("arguements length：", len(sys.argv))
    print("type:", type(sys.argv))
    print("function name:", sys.argv[0])
    print("the first arg is:", sys.argv[1])
    print("the second arg is:", sys.argv[2])

👉 in command line: python pass_arg_scri.py 30 jing

  • Using argparse library
    in function add_argument():
    🔹--xx full argument input
    🔹-x simple argument input
    🔹type the type of input argument
    🔹default default value
    🔹help introduction of arguements
    🔹nargs the number of arguements, "+" means All command-line arguments present are gathered into a list
    🔹required if it is required arguement
import argparse

def pass_arg_scri2():
    parser = argparse.ArgumentParser(description='argparse testing')
    parser.add_argument('--name','-n',type=str, default = "jing",required=True,help="a programmer's name")
    parser.add_argument('--age','-a',type=int, default=35,help='age of the programmer')
    parser.add_argument('--sex','-s',type=str, default='male')
    parser.add_argument('--favorite','-f',type=str, nargs="+",required=False,help="favorite of the programmer")
    args = parser.parse_args()
    print(args.name, args.age, args.sex, args.favorite)

👉 in command line: python pass_arg_scri2.py -n jing -a 30 -s female or python pass_arg_scri2.py --name jing --age 30 --sex female

🟢 Pass arguments to a script from shell

  • Run python code with shell

📜in python script (arg_pass.py):

def pass_shell():
    return "function without arguements"

🐚 in shell:

#!/bin/bash
python arg_pass.py

or

#!/bin/bash
python -c 'import arg_pass; print(arg_pass.pass_shell())'

👉 in command line: bash shell_function.sh or sh shell_function.sh

  • Pass arguments to python script with shell

📜in python script (arg_pass.py):

def pass_arg_shell(x):
    return f"function with arguements, and the arguement is{x}"

🐚 in shell:

#!/bin/bash
python -c "import arg_pass; print(arg_pass.pass_arg_shell('$1'))"

👉 in command line: bash shell_function.sh jing

Reference