auto save

a.py

+i=3
 username="ltg"
 userpassword="20131203"
 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:
-        print("登录成功")
-        break
-    elif name!=username:
-        print("请重新输入用户名")
-    else: 
-        print("请重新输入密码")
+    password=input("请输入密码")
+        i=i-1
+        if name==username and password==userpassword:
+            print("登录成功")
+            break
+        if name!=username:
+            print("请重新输入用户名")
+            print("你还有"+str(i)+"次机会")
+            continue
+        if password!=userpassword 
+            print("请重新输入密码")
+    else:
+        print("你废了")
 print("你被骗了")