save project

diy2.py

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