Created
April 18, 2012 17:45
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Python Autovivification
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class AutoVivification(dict): | |
"""Implementation of perl's autovivification feature.""" | |
def __getitem__(self, item): | |
try: | |
return dict.__getitem__(self, item) | |
except KeyError: | |
value = self[item] = type(self)() | |
return value | |
a = AutoVivification() | |
a[1][2][3] = 4 | |
a[1][3][3] = 5 | |
a[1][2]['test'] = 6 | |
print a # {1: {2: {'test': 6, 3: 4}, 3: {3: 5}}} |
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