利用python的标准库hashlib 的md5()生成唯一的id

 1 import hashlib
 2 import time
 3 
 4 def generate_md5():
 5     m = hashlib.md5()
 6     m.update(bytes(str(time.perf_counter()),encoding=‘utf8‘)) #perf_counter() 可以精确到纳秒级别（保证不会重名）
 7     return m.hexdigest()
 8 
 9 class School():
10     def __init__(self,s_id,name,addr):
11         self.id = s_id
12         self.name = name
13         self.addr = addr
14     def printInfo(self):
15         print("学校id：{}".format(self.id))
16 
17 class Course():
18     def __init__(self,c_id,name,addr):
19         self.id = c_id
20         self.name = name
21         self.addr = addr
22     def printInfo(self):
23         print("课程id：{}".format(self.id))
24 
25 if __name__ =="__main__":
26  27     school = School(generate_md5(),"KAIYUAN","ShangHai")
28     course = Course(generate_md5(),"Python","Beijing")
29 
30     school.printInfo()
31     course.printInfo()