Write a program to
combine two dictionary-adding values for common keys and display the result on
the screen.
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Program Listing
from collections
import Counter
a1 = {'a': 10, 'b':
20, 'c':30}
a2 = {'a': 20, 'b':
10, 'c':40}
a3 = {'a': 30, 'b':
40, 'c':20}
display_result =
Counter(a1) + Counter(a2) + Counter(a3)
print()
print("\tCOMBINE
THREE DICTIONARY ADDING VALUES FOR COMMON KEYS")
print()
print("\tDISPLAY
RESULT")
print()
print("\t",display_result)
print()
print()
print("\tEND OF
PROGRAM")