diff options
Diffstat (limited to 'Doc/library/contextlib.rst')
| -rw-r--r-- | Doc/library/contextlib.rst | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/Doc/library/contextlib.rst b/Doc/library/contextlib.rst index 2d28fb3..1b55868 100644 --- a/Doc/library/contextlib.rst +++ b/Doc/library/contextlib.rst @@ -66,6 +66,8 @@ Functions and classes provided: # Code to release resource, e.g.: release_resource(resource) + The function can then be used like this:: + >>> with managed_resource(timeout=3600) as resource: ... # Resource is released at the end of this block, ... # even if code in the block raises an exception @@ -140,9 +142,9 @@ Functions and classes provided: finally: print(f'it took {time.monotonic() - now}s to run') - @timeit() - async def main(): - # ... async code ... + @timeit() + async def main(): + # ... async code ... When used as a decorator, a new generator instance is implicitly created on each function call. This allows the otherwise "one-shot" context managers @@ -249,15 +251,15 @@ Functions and classes provided: :ref:`asynchronous context managers <async-context-managers>`:: async def send_http(session=None): - if not session: - # If no http session, create it with aiohttp - cm = aiohttp.ClientSession() - else: - # Caller is responsible for closing the session - cm = nullcontext(session) + if not session: + # If no http session, create it with aiohttp + cm = aiohttp.ClientSession() + else: + # Caller is responsible for closing the session + cm = nullcontext(session) - async with cm as session: - # Send http requests with session + async with cm as session: + # Send http requests with session .. versionadded:: 3.7 @@ -396,6 +398,8 @@ Functions and classes provided: print('Finishing') return False + The class can then be used like this:: + >>> @mycontext() ... def function(): ... print('The bit in the middle') @@ -466,6 +470,8 @@ Functions and classes provided: print('Finishing') return False + The class can then be used like this:: + >>> @mycontext() ... async def function(): ... print('The bit in the middle') |