d={'a':1,'b':2,'c':3,'d':4,'e':5}
for key in d:
print(key)
for value in d.values():
print(value)
for k,v in d.items():
print(k,v)
for ch in "abcd":
print(ch)
from collections import Iterable
print(isinstance('abc', Iterable))
print(isinstance([1, 2, 3], Iterable))
print(isinstance(1234, Iterable))
for i,value in enumerate(['a','B','C']):
print(i,value)
for x,y in [(1,2),(2,4),(4,5)]:
print(x,y)
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