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  1. def foo(s = []):
  2. 	print(s)
  3. 	s += [1]
  4.  
  5. foo()
  6. foo()
  7. foo()
  8.  
Success #stdin #stdout 0.02s 8736KB
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stdin
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Standard input is empty
stdout
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[]
[1]
[1, 1]
https://ideone.com/pi3SAC
landmine with default arguments in python
language:
Python 3 (python  3.12)
created:
10 years ago
visibility:
public

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