d6.py

l1=[1,'a',2,'b',3,'c',4,'d']
#Creating list containing keys alone by slicing
l2=l1[::2]
#Creating list containing values alone by slicing
l3=l1[1::2]
#merging two lists uisng zip()
z=zip(l2,l3)
#Converting zip object to dict using dict() constructor.
print (dict(z))
#Output:{1: 'a', 2: 'b', 3: 'c', 4: 'd'}