mysql 自定义函数,生成 n 个字符长度的随机字符串 -- sql function delimiter $$ create function rand_str(n int) returns VARCHAR(255) BEGIN declare str VARCHAR(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSQUVWXYZ'; declare i int DEFAULT 0; declare res_str VAR…
https://docs.python.org/2.7/tutorial/modules.html Modules If you quit from the Python interpreter and enter it again, the definitions you have made (functions and variables) are lost. Therefore, if you want to write a somewhat longer program, you are…