how to execute a python script file with an argument from inside another python script file

Question

my problem is that I want to execute a python file with an argument from inside another python file to get the returned values....

I don\'t know if I\'ve explained

Answer 1

Another way that may be preferable to using os.system() would be to use the subprocess module which was invented to replace os.system() along with a couple of other slightly older modules. With the following program being the one you want to call with some master program:

import argparse

# Initialize argument parse object
parser = argparse.ArgumentParser()

# This would be an argument you could pass in from command line
parser.add_argument('-o', action='store', dest='o', type=str, required=True,
                    default='hello world')

# Parse the arguments
inargs = parser.parse_args()
arg_str = inargs.o 

# print the command line string you passed (default is "hello world")
print(arg_str)

Using the above program with subproccess from a master program would would look like this:

import subprocess

# run your program and collect the string output
cmd = "python your_program.py -o THIS STRING WILL PRINT"
out_str = subprocess.check_output(cmd, shell=True)

# See if it works.
print(out_str)

At the end of the day this will print "THIS STRING WILL PRINT", which is the one you passed into what I called the master program. subprocess has lots of options but it is worth using because if you use it write your programs will be system independent. See the documentation for subprocess, and argparse.