auto save

.py

+username='python'
+userpassword='123456'
+i=3
+while True:
+    if i>0:
+        name=input("请输入账号")
+        password=input("请输入密码")
+        i-=1
+        if username==name and userpassword==password:
+            break
+        if username!=name:
+            print("账号错误")
+            continue
+        if password!=userpassword:
+            print("密码错误")
+    else:
+        print("三次机会用完了")
+        exit()
+print("欢迎来到贝尔编程")
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