c2.py

from collections import ChainMap
d1={'a':1,'b':2}
d2={'c':3,'d':4}
chain=ChainMap(d1,d2)
print (chain)#Output:ChainMap({'a': 1, 'b': 2}, {'c': 3, 'd': 4})


#maps attribute will return list of mappings
d3=chain.maps
print (d3)#Output:[{'a': 1, 'b': 2}, {'c': 3, 'd': 4}]
#Return type is List
print (type(d3))#Output:<class 'list'>

#performing list methods 
d3=chain.maps
print (list(reversed(d3)))


#printing the keys
print (list(chain.keys()))#Output:['c', 'd', 'a', 'b']
#printing the values
print (list(chain.values()))#Output:[3, 4, 1, 2]