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dict.setdefault(key, default=None)

#!/usr/bin/python3

tinydict = {'Name': 'tutorialpro', 'Age': 7}

print("Value of Age key: %s" % tinydict.setdefault('Age', None))
print("Value of Sex key: %s" % tinydict.setdefault('Sex', None))
print("New dictionary:", tinydict)

Value of Age key: 7
Value of Sex key: None
New dictionary: {'Age': 7, 'Name': 'tutorialpro', 'Sex': None}