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  1. import collections
  2.  
  3. class MyUserDict(collections.UserDict):
  4. 	def __getitem__(self, item):
  5. 		if item == "A":
  6. 			return "B"
  7. 		return super().__getitem__(item)
  8.  
  9. print("{A}".format_map(MyUserDict()))
  10. print("{A}".format(**MyUserDict()))
Runtime error #stdin #stdout #stderr 0.04s 10240KB
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stdin
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Standard input is empty
stdout
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B
stderr
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Traceback (most recent call last):
  File "./prog.py", line 10, in <module>
KeyError: 'A'
https://ideone.com/TXjPyX
language:
Python 3 (python  3.12)
created:
9 years ago
visibility:
secret

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