Python with Keyword
Example
Use with to manage a resource via a context manager:
import contextlib
with contextlib.nullcontext("resource") as r:
print("Using", r)
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Definition and Usage
The with keyword wraps a block of code using a context manager.
It ensures setup and cleanup logic (__enter__ / __exit__) happen automatically, simplifying resource management and exception handling.
More Examples
Example
Create and use a custom context manager class:
class MyCtx:
def __enter__(self):
print("Enter")
return "res"
def __exit__(self, exc_type, exc, tb):
print("Exit")
with MyCtx() as res:
print("Using", res)
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Example
Use multiple context managers in one statement:
import contextlib
with contextlib.nullcontext("A") as a, contextlib.nullcontext("B") as b:
print(a, b)
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