ch8.py

from collections import Counter

c1=Counter({'a':2,'b':1,'c':4,'d':3})
c2=Counter({'a':3,'b':5,'e':7})
#update() method in Counter object add the count of elements
c1.update(c2)#Output:Counter({'e': 7, 'b': 6, 'a': 5, 'c': 4, 'd': 3})
print (c1)


#dict update
#Update() method adds elements to the dictionary if key is not in that dictionary. If key is in the dictionary means, it will update the new value.
d1={'a':2,'b':1,'c':4,'d':3}
d2={'a':3,'b':5,'e':7}
d1.update(d2)
print (d1)#Output:{'a': 3, 'b': 5, 'c': 4, 'd': 3, 'e': 7}