8for emumrate range

Posted 2021-02-01 liusiluandzhangkun

1、for循环
用户按照顺序循环可迭代对象中的内容，
PS：break、continue
li = [11,22,33,44]
for item in li:
print item

 
2、enumrate

为可迭代的对象添加序号
li = [11,22,33]
for k,v in enumerate(li, 1):
print(k,v)

3、range和xrange
指定范围，生成指定的数字
print range(1, 10)
# 结果：[1, 2, 3, 4, 5, 6, 7, 8, 9]

print range(1, 10, 2)
# 结果：[1, 3, 5, 7, 9]

print range(30, 0, -2)
# 结果：[30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2]