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ch18: update from book draft

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This commit is contained in:
Luciano Ramalho
2020-02-19 00:15:20 -03:00
parent d63b4844f1
commit 0ca34e2676
3 changed files with 22 additions and 22 deletions
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16
18-context-mngr/mirror.py
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@@ -4,7 +4,7 @@ A "mirroring" ``stdout`` context.
While active, the context manager reverses text output to
``stdout``::
# BEGIN MIRROR_DEMO_1
# tag::MIRROR_DEMO_1[]
>>> from mirror import LookingGlass
>>> with LookingGlass() as what: # <1>
@@ -18,12 +18,12 @@ While active, the context manager reverses text output to
>>> print('Back to normal.') # <5>
Back to normal.
# END MIRROR_DEMO_1
# end::MIRROR_DEMO_1[]
This exposes the context manager operation::
# BEGIN MIRROR_DEMO_2
# tag::MIRROR_DEMO_2[]
>>> from mirror import LookingGlass
>>> manager = LookingGlass() # <1>
@@ -40,11 +40,11 @@ This exposes the context manager operation::
>>> monster
'JABBERWOCKY'
# END MIRROR_DEMO_2
# end::MIRROR_DEMO_2[]
The context manager can handle and "swallow" exceptions.
# BEGIN MIRROR_DEMO_3
# tag::MIRROR_DEMO_3[]
>>> from mirror import LookingGlass
>>> with LookingGlass():
@@ -63,12 +63,12 @@ The context manager can handle and "swallow" exceptions.
...
NameError: name 'no_such_name' is not defined
# END MIRROR_DEMO_3
# end::MIRROR_DEMO_3[]
"""
# BEGIN MIRROR_EX
# tag::MIRROR_EX[]
class LookingGlass:
def __enter__(self): # <1>
@@ -89,4 +89,4 @@ class LookingGlass:
# <11>
# END MIRROR_EX
# end::MIRROR_EX[]