save project

fs.py

 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:
-        print("用户名错误")
-        continue
-    if password!=userpassword:
-        print("密码错误")
-        continue
+i=3
+if i=0
+    while True:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i-=1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            i+=1
+            break
+        if name!=username:
+            print("用户名错误")
+            continue
+        if password!=userpassword:
+            print("密码错误")
+            continue
+    else:
+        exit()
 print("欢迎来到贝尔编程!")
\ No newline at end of file