$ python food.py pizza pasta gelato
Args len: 4
Arg 1: food.py
Arg 2: pizza
Arg 3: pasta
Arg 4: gelato

>>> path = os.getcwd()
>>> for entry in os.scandir(path):
...    if not entry.name.startswith('.') and entry.is_file():
...        print(entry.name)

>>> f = open("new_test_file.py", "r")
>>> f.read()
'def a(): pass'
>>> f.close()
>>> f = open("new_test_file.py", "r")
>>> f.readlines()
['def a(): pass']

with open("new_test_file.py", "w") as f:
...     f.write("def a(): pass")

with open("new_test_file.py", "a") as f:
...     f.write("print(a())")

if __name__ == "__main__":
    print("In {0} module".format(__name__))