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  1. class Default(dict):
  2. def __missing__(self, key):
  3. return key
  4.  
  5. print('{name} was born in {country}'.format_map(Default(name='Guido')))
  6. print('{name} was born in {country}'.format(**Default(name='Guido')))
Success #stdin #stdout 0.04s 9440KB
stdin
Standard input is empty
stdout
Guido was born in country
Guido was born in country