i12.py

import itertools
##iterator will start displaying after condition is False.
l1=itertools.dropwhile(lambda x:x>4,[5,6,7,8,9,1,2,3])
print (l1)#Output:<itertools.dropwhile object at 0x02E592C8>
print (list(l1))#Output:[1, 2, 3]
#iterator used to print values till condition is False.
l4=itertools.takewhile(lambda x:x>4,[5,6,7,8,9,1,2,3])
print (list(l4))#Output:[5, 6, 7, 8, 9]


#iterator will start displaying after condition is False.
l2=itertools.dropwhile(lambda x:x%2==0,[2,4,6,8,10])
print (list(l2))#Output:[]
#iterator used to print values till condition is False.
l3=itertools.takewhile(lambda x:x%2==0,[2,4,6,8,10])
print (list(l3))#Output:[2, 4, 6, 8, 10]