看B站视频学习flask-SQLalchemy时,报错RuntimeError: No application found. Either work inside a view function or push an application context. See http://flask-sqlalchemy.pocoo.org/contexts/ 视频链接是https://bilibili.com/video/av19817183?p=20 P20 04-03数据库的基本操作1-增删改 位…
How to view word document in WPF application (CSVSTOViewWordInWPF) Introduction The Sample demonstrates how to view word document in WPF application. WPF does not support to view Word documents directly but some customers want to show word document i…
view function 的几种返回值 return HttpResponse(html) return HttpResponseNotFound(html) raise Http404("Poll does not exist") #定制:在template tree顶层编写404.html handler400…
使用Flask定义URL的时候,如果出现"AssertionError: View function mapping is overwriting an existing endpoint function"这个异常信息,就说明定义了多个同名的视图函数,只需要改成不同的函数名即可. 这是为什么呢? 原来flask中url跟视图函数并不是直接对应的,而是有一个中间者-endpoint. 三者之间的关系是这样的: ``` url---->endpoint---->view_fu…