context_lib.py

"""contextlib library
"""
import contextlib


@contextlib.contextmanager
def show(name: str) -> str:
    """show name

    Args:
        name (str): name of user

    Yields:
        str: name with format
    """
    # __enter__
    print('Starting Context Manger...', name)
    yield f"name: {name}"
    # __exit__
    print('Ending Context Manger...', name)


with show('salar') as one, show('ali') as two:
    print(one)
    print(two)


class MyContextManager(contextlib.ContextDecorator):
    """my custom context manager
    """

    def __enter__(self):
        print('Starting...')

    def __exit__(self, exc_type, exc_val, exc_tb):
        print('Exiting...')


with MyContextManager():
    print('OK')


@MyContextManager()
def show_hello():
    """show hello message
    """
    print('Hello, there!')


show_hello()