When using os.execlp, why `python` needs `python` as argv[0]

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When python is executed, it creates sys.argv for you. The values in that list are based on the arguments passed to it by the operating system, but it leaves off the sys.executable value from that list.

In other words, when Python is invoked, it sets sys.argv to everything but it’s own executable.

When you invoke a new executable via os.execlp(), you still need to include Python in that as that is what executable that the OS will run. The first two values of what you a pass to os.execlp() are still required, whatever you find in sys.argv later on.

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