d4.py

#creating dictionary by using iterables
d=dict([('red',1),('blue',2),('green',3)])
print (d)#Output:{'red': 1, 'blue': 2, 'green': 3}


#Returns the length(number of keys)of dictionary
print (len(d))#Output:3


#Returns the list of keys in the dictionary
print(list(d))#Output:['red', 'blue', 'green']


#Returns the sorted list of keys in the dictionary(by default ascending order)
print (sorted(d))#Output:['blue', 'green', 'red']


#Returns the sorted list of keys in the dictionary in descending order.
print (sorted(d,reverse=True))#Output:['red', 'green', 'blue']


#Returns the reversed list of keys in the dictionary.Returns an iterator object.
print (reversed(d))#Output:<dict_reversekeyiterator object at 0x005DEB90>
#Iterator object is converted to list object
print (list(reversed(d)))#Output:['green', 'blue', 'red']