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Last active July 10, 2020 05:00
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ch11.py
from collections import Counter
#Unary addition removes zero and negative count
c=Counter({'a':1,'b':2,'c':-5})
print (+c)#Output:Counter({'b': 2, 'a': 1})
#unary subtraction
c1=Counter({'a':1,'b':2,'c':-5})
print (-c)#Output:Counter({'c': 5})
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