for k,v in [(1,2),(3,4),(5,6)]:
    print(k,v)
# 1 2
# 3 4
# 5 6

try:
    for k,v,z in [(1,2,7),(3,4,8),(5,6)]:
        print(k,v,z)
except:
    print(exception.__class__.__name__)
# 1 2 7
# 3 4 8
# ValueError

try:
    for k,v in [1,2,3]:
        print("type error")
except:
    print(exception.__class__.__name__)
# TypeError

for k, v in {'a': 1, 2: 'b'}.items():
    print(k,v)
# a 1
# 2 b

for i in {'a': 1, 2: 'b'}.items():
    print(i)
# ('a', 1)
# (2, 'b')

print(['{}: {}'.format(repr(k),repr(v)) for k, v in {1: 2, 3: 4}.items()])
# ['1: 2', '3: 4']

print([x for x,y in [(1,2),(3,4),(5,6)] if x + y > 3])
# [3, 5]

print(', '.join(['{}: {}'.format(repr(k),repr(v)) for k, v in {1: 2, '3': 4, 5: 'six', 'seven': 8}.items() if isinstance(k,str)]))
# '3': 4, 'seven': 8