Contextmanager

# Übung 26 -- Contextmanager

from contextlib import contextmanager

@contextmanager

def myContext(filename, mode):

print("Start context")

try:

# __enter__()

print("__enter__")

aFile = open(filename, mode)

yield aFile # return value of __enter__()

finally:

# __exit__()

print("__exit__")

with myContext("enrico.txt", 'w') as myFile:

myFile.write("Enrico\n")

import sys

class Redirect(object):

def __init__(self, aFile):

self.old_stdout = sys.stdout

self.aFile = aFile

def __enter__(self):

sys.stdout = self.aFile

def __exit__(self, *args): # we ignore the parameter list

sys.stdout = self.old_stdout

self.aFile.close()

with Redirect(open("enrico.txt",'w')):

print("Enrico redirected Maasch")

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