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</source> :In order to read arguments in Python, we will need to '''import special variables''' from the system. This is a standard 'library' of code provided by the developers of Python. By issuing '''import sys''', you have loaded code written by another person, each 'library' that gets loaded will give us extra functionality in our program. This is done by issuing the import sys function within your ipython3 shell.<br><br>