arguments help

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6 Replies - 4068 Views - Last Post: 01 February 2011 - 11:37 AM Rate Topic: -----

#1 Guest_baddlust*


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arguments help

Posted 31 January 2011 - 02:49 PM

I made a program in C++ so i want to use python for calling it.

os.system("D:\\C++ Projects\\basic.exe <arg here> ")


How can i make this working..

I want the arguments to enter in python too when calling the program.

tnx for your time
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Replies To: arguments help

#2 Eric115  Icon User is offline

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Re: arguments help

Posted 01 February 2011 - 01:27 AM

Do you need to use the command line to open it? Maybe you could use subprocess like this:
subprocess.call('D:\\C++ Projects\\basic.exe')

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#3 Guest_butthead*


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Re: arguments help

Posted 01 February 2011 - 05:51 AM 

my $arg="me";
system("\"C:\\Program Files\\c++\" program.exe \"$arg\"\r\n");



To be more specific i want to make this perl script in python.
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#4 Simown  Icon User is offline

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Re: arguments help

Posted 01 February 2011 - 06:07 AM

To get an argument in a string, you need the string quantifier %s:

arg = raw_input("Enter an argument")                 #Ask the user to enter an argument
os.system("D:\\C++ Projects\\basic.exe  %s ") % arg


Was that more what you were thinking of?


This is in Python 2.x but the concept is the same for all versions.

This post has been edited by Simown: 01 February 2011 - 06:11 AM

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#5 Guest_butthead*


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Re: arguments help

Posted 01 February 2011 - 06:14 AM

Yeah tnx for the reply but a get an error

Quote

TypeError: unsupported operand type(s) for %: 'int' and 'str'


Any hints?
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#6 Simown  Icon User is offline

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Re: arguments help

Posted 01 February 2011 - 09:09 AM

To include a number in the formatting you can:

arg = 2
os.system("D:\\C++ Projects\\basic.exe  %i ") % arg


With the integer qualifier %i. See String Formatting for more information.

If you really want it as a string, you can typecast the argument:

arg = 2
os.system("D:\\C++ Projects\\basic.exe  %s ") % str(arg)

This post has been edited by Simown: 01 February 2011 - 09:10 AM

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#7 atraub  Icon User is offline

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Re: arguments help

Posted 01 February 2011 - 11:37 AM

I'd recommend using:
arg = 2
os.system("D:\\C++ Projects\\basic.exe  "+str(arg))


Because the other approach is considered deprecated on the current versions of Python.
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