L[:i]

L[-j:]

L[:]

L[::2]

for key in d:

for ch in 'ABC':

元组

from collections import Iterable
isinstance('abc', Iterable)

迭代索引和元素本身
for i, value in enumerate(['A', 'B', 'C']):

for value in d.values():

for k, v in d.items():

加判断条件
[x * x for x in range(1, 11) if x % 2 == 0]

两层循环
[m + n for m in 'ABC' for n in 'XYZ']

使用2个变量
[k + '=' + v for k, v in d.items()]

把一个list中所有的字符串变成小写
[s.lower() for s in L]

列表生成式的[]改成()

yield

next()函数

迭代generator