![]() The return value from the call() function is the exit code of the program. Subprocess.call('echo $HOME', shell=True) ![]() The default is to run a command directly. Setting a shell argument to the true value causes the subprocess to spawn the intermediate shell process and tell it to run a command. subprocess.check_output(args, *, stdin=None, stderr=None, shell=False, universal_newlines=False) We can get the output of the program and store it in the string directly using check_output. It lists all the files and folders in the current directory. subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False) The parameter is a list of which the first argument must be the program name. Subprocess has a method call() which can be used to start a program. If you want to wait for a program to finish, you can call the Popen.wait() function. The stderr will be written only if the error occurs. The municate() call reads the input and output from a process. Process = Popen(, stdout=PIPE, stderr=PIPE) Now, write the following code inside the app.py file. Inside the mod.py, write the following code. Now, inside your python project folder, create two files. You can start the program with any parameter. For example, the program below starts the UNIX program ‘cat’, and the second parameter is an argument. You can start the process in Python using a Popen function call.
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