DefaultDict
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from collections import defaultdict
##### USING INDUILT FUNCTION #####
default_dict1 = defaultdict(int, {'a':10, 'b':20})
print(default_dict1['a']) # 10
print(default_dict1['b']) # 20
print(default_dict1['c']) # 0
print(default_dict1['z']) # 0
# **NOTE as int() returns the default value of integer type, i.e., 0
##### USING LAMBDA #####
default_dict2 = defaultdict(lambda: 0, {'a':10, 'b':20})
print(default_dict2['a']) # 10
print(default_dict2['b']) # 20
print(default_dict2['c']) # 0
print(default_dict2['z']) # 0
##### USING LAMBDA 2 #####
default_dict3 = defaultdict(lambda: "Key doesn't exists", {'a':'apple', 'b':'ball'})
print(default_dict3['a']) # apple
print(default_dict3['b']) # ball
print(default_dict3['c']) # Key doesn't exists
print(default_dict3['z']) # Key doesn't exists
Python
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