class ManagedFile:                     # A user-defined context manager for text files   
    def __init__(self, filename):
        self.filename = filename
        self.file = None

    def __enter__(self):
        self.file = open(self.filename, 'w')
        print('File opened and written')
        return self.file

    def __exit__(self, exc_type, exc_value, traceback):
        if self.file:
            self.file.close()
        print('Exception:', exc_type, exc_value, traceback)

with ManagedFile('managed_file.txt') as file:     # Using the user-defined context manager
    note = input("Write some text and Press Enter to continue...\n  ") 
    file.write(note)

print("Managed file has been written and closed automatically.")

# The file is automatically closed after the with block, even if an exception occurs.