Python

1.将字符串 'k:1|k1:2|k2:3|k3:4' 转换成字典{'k': '1', 'k1': '2', 'k2': '3', 'k3': '4'}

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2。打印99乘法表

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3.冒泡排序

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4.字符串逆序

a = "abcdefg"

1.切片 a[::-1]

2.t = list(a)

t.reverse  

"".join(t)