python context manager example

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Van
17 Aug 2019
1class File:
2  def __init__(self, filename, method):
3    self.file = open(filename, method)
4   
5  def __enter__(self):
6    print("Enter")
7    return self.file
8  
9  def __exit__(self, type, value, traceback):
10    print(f"{type}, {value}, {traceback}")
11    print("Exit")
12    self.file.close()
13
14with File("file.txt", "w") as f:
15  print("Middle")
16  f.write("hello")
17  raise Exception()
18  raise FileExistsEoor()
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