The cat command is short for ‘concatenate’ and is widely used in Linux and Unix programming. In the example below, you will use Unix’s cat command and example.py as the two parameters. The first parameter is the program you want to start, and the second is the file argument. It is possible to pass two parameters in the function call. To start a new process, or in other words, a new subprocess in Python, you need to use the Popen function call. You can also get exit codes and input, output, or error pipes using subprocess in Python. So, if you want to run external programs from a git repository or codes from C or C++ programs, you can use subprocess in Python. It lets you start new applications right from the Python program you are currently writing. Subprocess in Python is a module used to run new codes and applications by creating new processes.
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