Command line arguments

---

examples/basics/cli.py

import sys

def main():
    print(sys.argv)
    print(sys.argv[0])
    print(sys.argv[1])
    print(sys.argv[2])

main()

$ python examples/basic/cli.py one two

['examples/basics/cli.py', 'one', 'two']
examples/basics/cli.py
one
two

$ python examples/basic/cli.py

['examples/basics/cli.py']
examples/basics/cli.py
Traceback (most recent call last):
  File "examples/basics/cli.py", line 6, in <module>
    print(sys.argv[1])
IndexError: list index out of range