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Last active July 15, 2020 20:30
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d6.py
from collections import defaultdict
#default_factory is not specified.
d=defaultdict()
d['a']=1
d['b']=2
#default_factory attribute is None.
print (d)#Output:defultdict(None, {'a': 1, 'b': 2})
#Returns the default value for key.If not specified raises keyError.
#print (d.__missing__('a')) #Output:KeyError: 'a'
print (d.__missing__('z'))#Outptu:KeyError: 'z'
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