Connect and login to an FTP server and return ftplib.FTP object.

def connect(host, port, username, password):
        """Connect and login to an FTP server and return ftplib.FTP object."""
        # Instantiate ftplib client
        session = ftplib.FTP()

        # Connect to host without auth
        session.connect(host, port)

        # Authenticate connection
        session.login(username, password)
        return session