Python Context Manager

External

• https://www.pythontutorial.net/advanced-python/python-context-managers/

Internal

• Python Language

Overview

An execution context is useful when the code uses resources that need closing, even if the code follows an unexpected execution path, like when an exception is raised.

An execution context is equivalent with the following construct:

r = Resource()
r.open()
try:
  #
  # use resource, while anywhere in this code block exception might be thrown
  #
finally:
  r.close()