Python迭代器与生成器基本用法分析

> from collections import Iterable
> isinstance([], Iterable)
True
> isinstance({}, Iterable)
True
> isinstance('abc', Iterable)
True
> isinstance((x for x in range(10)), Iterable)
True
> isinstance(100, Iterable)
False

> from collections import Iterator
> isinstance((x for x in range(10)), Iterator)
True
> isinstance([], Iterator)
False
> isinstance({}, Iterator)
False
> isinstance('abc', Iterator)
False

g= (x*x for x in range(10))
for n in g:
 print(n)

def odd():
  print('step 1')
  yield 1
  print('step 2')
  yield(3)
  print('step 3')
  yield(5)