def looking_glass():
import sys
original_write = sys.stdout.write
def reverse_write(text):
original_write(text[::-1])
sys.stdout.write = reverse_write
yield 'JABBERWOCKY'
sys.stdout.write = original_write
#Example 15-6: Testing code of Example 15-5
from mirror_gen import looking_glass
with looking_glass() as what:
print('Alice, Kitty and Snowdrop')
print(what)
#pordwonS dna yttiK ,ecilA
#YKCOWREBBAJ
what
#'JABBERWOCKY'
#Example 15-7: Example 15-5 w/ exception handling
import contextlib
@contextlib.contextmanager
def looking_glass():
import sys
print("what {}\n----------".format(what))
print('Back to normal.')
from mirror import LookingGlass
manager = LookingGlass()
print("manager {}\n----------".format(manager))
monster = manager.__enter__()
monster == 'JABBERWOCKY'
print("monster {}\n----------".format(monster))
print("manager {}\n----------".format(manager))
manager.__exit__(None, None, None)
print("monster {}\n----------".format(monster))
from mirror_gen import looking_glass
with looking_glass() as what:
print('Alice, kitty and Snowdrop')
print(what)
print("what {}\n----------".format(what))
# bit.ly/1MM96aR Martijin's
from contextlib import contextmanager
import io
import os
@contextmanager
def inplace(filename,
mode='r',
buffering=-1,
from mirror_gen import looking_glass
import sys
with looking_glass(age=32, name="bert") as enterResult:
sys.stdout.write(enterResult)
sys.stdout.write("\n")
sys.stdout.write("It is reversed")
sys.stdout.write("\n")
a = 5 / 0
sys.stdout.write("It is normal\n")