From Al Lukaszewski,
Your Guide to Python.
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Programming is pointless if you cannot run, or execute, the program you write. Executing a Python program tells the Python interpreter to convert the Python program into something the computer can read and act upon. There are two ways to do this: using a Python shell and calling the Python interpreter with a "bang" line.

Other tutorials in this series: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8