save project

diy2.py

+i=3
+username = "python"
+userpassword = "123456"
+while True:
+    if i>0:
+        a= input("请输入用户名:")
+        b = input("请输入密码:")
+        i-=1
+        if a == username and b == userpassword:
+            print("登录成功!")
+            break
+        if a!=username:
+            print('账号错')
+            
+        if b!=userpassword:
+            
+            print('密码错')
+    else:
+        exit()
+
+
+
+print('欢迎')
+
+