diff --git a/app/account_service.py b/app/account_service.py
index cfab6e8..9b1c46b 100644
--- a/app/account_service.py
+++ b/app/account_service.py
@@ -27,7 +27,6 @@ def signup():
             return str(warn)
         
         available = check_username_availability(username)
-        
         if not available: # 用户名不可用
             flash('用户名 %s 已经被注册。' % (username))
             return render_template('signup.html')