6.20 Write function reverse() that takes as input a phone book, that is, a dictionary mapping names (the keys) to phone numbers (the values). The function should return another dictionary representing the reverse phone book mapping phone numbers (the keys) to the names (the values). >>> phonebook [‘smith, Jane: 123-45-67′, Doe, John’: 987-65-43′,’Baker,David: 567-89-01) >>>reverse(phonebook) [123-45-67: Smith, Jane’, “567-89-01: Baker,David’, “987-65-43′: ‘Doe, John’)
Code:
def reverse(phonebook):
new_dict = dict(zip(phonebook.values(),phonebook.keys()))
return new_dict
phonebook = {‘Smith,Jane’:’123-45-67′, ‘Doe,John’:’987-65-43′,’Baker,David’:’567-89-01′}
print(“nOriginal Phonebook”)
print(phonebook)
print(“After interchanging key and values”)
print(reverse(phonebook))
Output:
Python 3.6.1 (default, Dec 2015, 13:05:11)
[GCC 4.8.2] on linux
Original Phonebook
{'Smith,Jane': '123-45-67', 'Doe,John': '987-65-43', 'Baker,David': '567-89-01'}
After interchanging key and values
{'123-45-67': 'Smith,Jane', '987-65-43': 'Doe,John', '567-89-01': 'Baker,David'}
![main.pysaved Python 3.6.1 (default, Dec 2015, 13:05:11) [GCC 4.8.2] on linux 1 def reverse (phonebook) 2 new_dict-dict (zip(phonebook.values(), phonebook.keys ())) 3 return die 4 5 phonebookSmith,Jane 123-45-67Doe, Original Phonebook Smith, Jane 123-45-67, Doe,John: 987-65-43, Baker,David 567-89-01) After interchanging key and values (123-45-67: Smith,Jane, 987-65-43D,John, 567-89-01: Baker,David John: 987-65-43, Baker,David: 567-89-01 6 print(Inoriginal Phonebook 7 print(phonebook) 8 9 print( After interchanging key and values) print (reverse (phonebook)) 1e](https://media.cheggcdn.com/media%2F769%2F76965da5-c79f-48db-afad-c54a51feef34%2FphpBsp8B3.png)
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