save project

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    while True:   
+        name = input("请输入用户名:")
+        if name != username:
+            print("账号错误，重新输入")
+            continue
+    while True:        
+        password = input("请输入密码:")
+        if password != userpassword:
+            print("错误，重新输入")
+            i-=1
+            continue
+    break
+print("欢迎来到贝尔编程!")
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