save project

diy2.py

+username = "python"
+userpassword = "123456"
+i=3
+while True:
+    if i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        if name==username and password==userpassword:
+            break
+            print("登录成功!")
+        if name!=username :  
+                print("用户名错误!请重新输入")
+                i=i-1
+                print("你还有"+str(i)+"次登录机会")
+                continue
+        if password!=userpassword:
+                print("密码错误!请重新输入")
+                i=i-1
+                print("你还有"+str(i)+"次登录机会")
+    else:
+        print("写错了")
+        exit()
+print("欢迎来到贝尔编程!")
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