# 特性
## 迭代
>>> from collections import Iterable
>>> isinstance('abc', Iterable) # str是否可迭代
for i, value in enumerate(['A', 'B', 'C']): # list實現下標
for x, y in [(1, 1), (2, 4), (3, 9)]:
## 列表生成式
[x * x for x in range(1, 11)]
[x * x for x in range(1, 11) if x % 2 == 0]
[m + n for m in 'ABC' for n in 'XYZ']
for k, v in dict.items():
## 生成器
g = (x * x for x in range(10))
next(g) # 0
next(g) # 1 ...
next(g) # 沒有的時候回報錯
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
StopIteration
for n in g:
