auto save

SB.py

+username = 'python'
+userpassword = '123456'
+while True:
+    name = input("请输入用户”)
+    possword = input("请输入用户”)
+    if name ==username and password ==username == userpossword:
+        print("登录成功!")
+    break
+    if name !=username:
+        print("用户名不存在,请重新输入")
+    if pass
+print("欢迎来到贝尔编程!")
+
+
+
+
+
+
+
+
+
+
+
+
+

diy2.py

+# 补充捐赠明细，两种写法：
+# 补充数据的第一种写法：
+file= open(r'C:\Users\CM\Desktop\book.txt','a',encoding='utf-8')
+file.write('小强：10本\n') 
+file.write('李明：15本\n')
+file.close()
+
+# 补充数据的第二种写法：
+with open(r'C:\Users\CM\Desktop\book.txt','a',encoding='utf-8') as file:
+    file.write('小强：10本\n') 
+    file.write('李明：15本\n')
\ No newline at end of file

py.SB

+username = 'python'
\ No newline at end of file