auto save

diy4-2.py

+i=3
+username = "python"
+userpassword = "123456"
+while True:
+    if i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i-=1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name!=username:
+            print("用户名有误，请重新输入")
+            print("温馨提示：您还有"+str(i)+"次登录机会")
+            continue
+        if password!=userpassword:
+            print("密码有误，请重新输入")
+            print("温馨提示：您还有"+str(i)+"次登录机会")
+    else:
+        print("你的账户已被锁")
+        exit()    
+print("欢迎来到贝尔编程!")
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