Hello Community,  I think there is a bug with the documentation with the topic "7. Input and Output"  Link: https://docs.python.org/3.6/tutorial/inputoutput.html    7.2. Reading and Writing Files  "open() returns a file object, and is most commonly used with two arguments: open(filename, mode)."    The arguments for this function are open(file, mode).  https://docs.python.org/3.6/library/functions.html#open  open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None)   Best regards Paulo G.P. https://about.me/paulogp https://www.python.org/users/paulogp/