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contextlib_exitstack_pop_all.py
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62 lines (54 loc) · 1.33 KB
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import contextlib
from module_contextlib.contextlib_context_managers import (
HandleError,
PassError,
ErrorOnExit,
ErrorOnEnter,
)
def variable_stack(contexts):
with contextlib.ExitStack() as stack:
for c in contexts:
stack.enter_context(c)
# Return the close() method of a new stack as clean-up function
return stack.pop_all().close
# Explicitly return None, indicating that the ExitStack could not
# be initialized cleanly but that cleanup has already occurred.
return None
print("No errors: ")
cleaner = variable_stack(
[
HandleError(1),
HandleError(2),
]
)
cleaner()
print("\nHandled error building context manager stack: ")
try:
cleaner = variable_stack(
[
HandleError(1),
ErrorOnEnter(2),
]
)
except RuntimeError as err:
print("caught error {}".format(err))
else:
if cleaner is not None:
cleaner()
else:
print("no cleaner returned")
print("\nUnhandled error building context manager stack: ")
try:
cleaner = variable_stack(
[
PassError(1),
ErrorOnEnter(2),
]
)
except RuntimeError as err:
print("caught error {}".format(err))
else:
if cleaner is not None:
cleaner()
else:
print("no cleaner returned")