from collections import Iterable, Iterator

def g():

yield 1

yield 2

yield 3

print("Iterable? [1,2,3]:", isinstance([1,2,3],Iterable))

print("Iterable? \'abc\':", isinstance('abc',Iterable))

print("Iterable? 123:", isinstance(123,Iterable))

print("Iterable? g():", isinstance(g(),Iterable))

print("Iterator? [1,2,3]:", isinstance([1,2,3],Iterator))

print("Interator? iter([1,2,3]):", isinstance(iter([1,2,3]),Iterator))

print("Iterator? \'abc\':", isinstance('abc',Iterator))

print("Itertor? 123:", isinstance(123,Iterator))

print("Itertor? g():", isinstance(g(),Iterator))

print ("for x in [1,2,3,4,5]:")

for x in [1,2,3,4,5]:

print(x)

print("for x in iter([1,2,3,4,5]:)")

for x in iter([1,2,3,4,5]):

print(x)

print("next():")

it=iter([1,2,3,4,5])

print(next(it))

print(next(it))

print(next(it))

print(next(it))

print(next(it))

d={"a":1,"b":2, "c":3}

print("iter key:",d)

for k in d.keys():

print("key:", k)

print("iter value:",d)

for v in d.values():

print("value",v)

print("iter item:",d)

for k,v in d.items():

print("item:", k,v)

print("iter enumerate([\'A\',\'B\',\'C\'])")

for i,value in enumerate(['A','B','C']):

print(i,value)

print("iter [(1,1), (2,4),(3,9)]:")

for x,y in [(1,1), (2,4),(3,9)]:

print(x,y)