save project

diy2.py

-username = "python"
+O=3
+username = "python" 
 userpassword = "123456"
 userpassword = "123456"
-while True:
-    a = input("请输入用户名:")
-    d = input("请输入密码:")
-    if name == username and password == userpassword:  
-        break
-        print("登录成功!")  
-    if a!=username:
-        print("有户名错误")  
-    if d!=userpassword:
-        print("密码错误"")
-    print("用户名和密码错误!请重新输入")
+while True: 
+    if O>0:
+        a = input("请输入用户名:")
+        d = input("请输入密码:")  
+        o-=1
+        if a == username and d == userpassword:  
+            break
+            print("登录成功!")  
+        if a!=username:
+            print("有户名错误")  
+        if d!=userpassword:
+            print("密码错误")   
+    else:
+        print("无法登录")  
+        exit()
+    print("用户名和密码错误!请重新输入")  
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
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