How to call a python script from different python script?

Question

I have a python "client.py" script as follows:

    import sys
    import traceback
    import client_new
    import subprocess
    def main():
        print "inside client"
        subprocess.Popen('C:/client_new.py',shell=True)
        #execfile('client_new.py')
    if __name__ == "__main__":
        is_sys_exit = False
        ret_val = 0
        try:
            ret_val = main()
        except SystemExit:
            is_sys_exit = True
        except:
            if not is_sys_exit:
                print( traceback.format_exc() )
                if sys.version_info < ( 3,0 ):
                    raw_input( "Press return to continue" )
                else:
                    input( "Press return to continue" )
                sys.exit( 1 )
        if is_sys_exit:
            print( "SystemExit Exception was caught." )
        sys.exit( ret_val )

The client_new.py script is as follows :

    import traceback
    def main():
        print "inside client new"

    if __name__ == "__main__":
        is_sys_exit = False
        ret_val = 0
        try:
            ret_val = main()
        except SystemExit:
            is_sys_exit = True
        except:
            if not is_sys_exit:
                print( traceback.format_exc() )
                if sys.version_info < ( 3,0 ):
                    raw_input( "Press return to continue" )
                else:
                    input( "Press return to continue" )
                sys.exit( 1 )
        if is_sys_exit:
            print( "SystemExit Exception was caught." )
        sys.exit( ret_val )

so, from client.py there is another script client_new.py being called using subprocess but when the client.py is executed it only prints its data and does not displays the print of client_new. Hence, i am not getting what am i doing wrong with the call of client_new.py. Please help what am i missing.

Why are you calling the other script in a subprocess, rather than simply importing and re-using its functionality? — jonrsharpe
– jonrsharpe, Commented Nov 9, 2016 at 12:25
@jonrsharpe actually i dont know how to do that could you please tell how — Learner
– Learner, Commented Nov 9, 2016 at 12:35

A. N. Other · Accepted Answer · 2016-11-09 12:41:06Z

Providing they are both in the same directory (or they are in the directory that python looks for (I believe called PYTHONPATH)), it is relatively simple to do. To import a python file, just remove the .py and import. Therefore you just need the following code.

import client_new
#Write rest of the code here
client_new.run_function()

You will also need to change your code slightly in client_new so that it can work.

import traceback
def main():
    print "inside client new"

def run_function():
    is_sys_exit = False
    ret_val = 0
    try:
        ret_val = main()
    except SystemExit:
        is_sys_exit = True
    except:
        if not is_sys_exit:
            print( traceback.format_exc() )
            if sys.version_info < ( 3,0 ):
                raw_input( "Press return to continue" )
            else:
                input( "Press return to continue" )
            sys.exit( 1 )
    if is_sys_exit:
        print( "SystemExit Exception was caught." )
    sys.exit( ret_val )

if __name__ == "__main__": #This is only run if called as an external script.
    run_function()

stackoverflow.com/questions/2349991/… might be helpful in addition...

Billy · Accepted Answer · 2016-11-09 12:47:13Z

If you have control over the client_new.py module, I'd strongly suggest A. N. Other's answer. If you don't, then change your main() function in client.py to:

def main():
    print 'inside client' 
    proc = subprocess.Popen('C:/client_new.py', shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    stdout = proc.stdout.read()
    stderr = proc.stdout.read()
    print 'Got output from client_new:\n' + stdout
    if stderr:
        print 'Got error output from client_new:\n' + stderr

Side note: don't use shell=True in subrocess if it can be avoided. Use subprocess.Popen(['client_new.py'], ...)

Collectives™ on Stack Overflow

How to call a python script from different python script?

2 Answers 2

1 Comment

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Linked

Related