save project

diy2.py

+username = "python"
+userpassword = "123456"
+i=4
+while True:
+    a=input("请输入用户名:")
+    b=input("请输入密码:")
+    i-=1
+    if i>0:
+
+        if a == username and b == userpassword:
+            print("登录成功!") 
+            break  
+        if a!=username :
+            print("用户名不存在!请重新输入")        
+            print("您还有"+str(i)+"次机会")
+            continue
+        if b != userpassword :
+            print("密码输入有误!请重新输入")    
+            print("您还有"+str(i)+"次机会")
+    else:
+        print("你的账户已被锁定，请带身份证来我司解锁")
+        exit()
+print("欢迎来到贝尔编程!")
+
+
+
+
+
+
+
+    # if a!=username and b == userpassword:
+    #     print("用户名不存在!请重新输入")        
+    # if a == username and b != userpassword :
+    #     print("密码输入有误!请重新输入")
+    # if a!=username and b != userpassword:
+    #     print("用户名和密码错误!请重新输入")