db.session.add(movie) # 添加到数据库会话 db.session.commit() # 提交数据库会话 flash('Item created.') # 显示成功创建的提示 return redirect(url_for('index')) # 重定向回主页 user = User.query flash() 的用法很简单，首先从 flask 包导入 flash 函数： from flask import flash 然后在视图函数里调用，传入要显示的消息内容： flash('Item Created.') flash() 函数在内部会把消息存储到 Flask 提供的 session 对象 里。 session 用来在请求间存储数据，它会把数据签名后存储到浏览器的 flash('Item created.') # 显示成功创建的提示 提示 在真实世界里，你会进行更严苛的验证，比如对数据去除首尾的空格。一般情 况下，我们会使用第三方库（比如 WTForms）来实现表单数据的验证工作。 第 7 章：表单 65 如果输入的某个数据为空，或是长度不符合要求，就显示错误提示“Invalid input.”， 否则显示成功创建的提示“Item Created

reqparse.RequestParser() parser.add_argument('task') # Todo # shows a single todo item and lets you delete a todo item class Todo(Resource): def get(self, todo_id): abort_if_todo_doesnt_exist(todo_id) output values. This example assumes that bit 1 in the flags attribute signifies a “Normal” or “Urgent” item, and bit 2 signifies “Read” or “Unread”. These items might be easy to store in a bitfield, but for Request object to source the arguments from (ex: headers, args, etc.), can be an iterator. The last item listed takes precedence in the result set. • choices – A container of the allowable values for the

reqparse.RequestParser() parser.add_argument('task') # Todo # shows a single todo item and lets you delete a todo item class Todo(Resource): def get(self, todo_id): abort_if_todo_doesnt_exist(todo_id) output values. This example assumes that bit 1 in the flags attribute signifies a “Normal” or “Urgent” item, and bit 2 signifies “Read” or “Unread”. These items might be easy to store in a bitfield, but for Request object to source the arguments from (ex: headers, args, etc.), can be an iterator. The last item listed takes precedence in the result set. choices – A container of the allowable values for the argument

reqparse.RequestParser() parser.add_argument('task') # Todo # shows a single todo item and lets you delete a todo item class Todo(Resource): def get(self, todo_id): abort_if_todo_doesnt_exist(todo_id) output values. This example assumes that bit 1 in the flags attribute signifies a “Normal” or “Urgent” item, and bit 2 signifies “Read” or “Unread”. These items might be easy to store in a bitfield, but for Request object to source the arguments from (ex: headers, args, etc.), can be an iterator. The last item listed takes precedence in the result set. • choices – A container of the allowable values for the

reqparse.RequestParser() parser.add_argument('task') # Todo # shows a single todo item and lets you delete a todo item class Todo(Resource): def get(self, todo_id): abort_if_todo_doesnt_exist(todo_id) output values. This example assumes that bit 1 in the flags attribute signifies a “Normal” or “Urgent” item, and bit 2 signifies “Read” or “Unread”. These items might be easy to store in a bitfield, but for Request object to source the arguments from (ex: headers, args, etc.), can be an iterator. The last item listed takes precedence in the result set. • choices – A container of the allowable values for the

reqparse.RequestParser() parser.add_argument('task') # Todo # shows a single todo item and lets you delete a todo item class Todo(Resource): def get(self, todo_id): abort_if_todo_doesnt_exist(todo_id) output values. This example assumes that bit 1 in the flags attribute signifies a “Normal” or “Urgent” item, and bit 2 signifies “Read” or “Unread”. These items might be easy to store in a bitfield, but for Request] object to source the arguments from (ex: headers, args, etc.), can be an iterator. The last item listed takes precedence in the resul set. choices – A container of the allowable values for the argument

reqparse.RequestParser() parser.add_argument('task') # Todo # shows a single todo item and lets you delete a todo item class Todo(Resource): def get(self, todo_id): abort_if_todo_doesnt_exist(todo_id) output values. This example assumes that bit 1 in the flags attribute signifies a “Normal” or “Urgent” item, and bit 2 signifies “Read” or “Unread”. These items might be easy to store in a bitfield, but for Request] object to source the arguments from (ex: headers, args, etc.), can be an iterator. The last item listed takes precedence in the resul set. choices – A container of the allowable values for the argument

Declaring Dependencies Dependencies are declared in the install_requires parameter as a list. Each item in that list is the name of a package that should be pulled from PyPI on installation. By default status code of the http exception. The special key None points to a list of tuples where the first item is the class for the instance check and the second the error handler function. To register an error value = (item_value / item_count) * offset / exp value = my_list[index] value = my_dict['key'] Bad: exp = - 1.05 value = ( item_value / item_count ) * offset / exp value = (item_value/item_count)*offset/exp

Declaring Dependencies Dependencies are declared in the install_requires parameter as a list. Each item in that list is the name of a package that should be pulled from PyPI on installation. By default status code of the http exception. The special key None points to a list of tuples where the first item is the class for the instance check and the second the error handler function. To register an error value = (item_value / item_count) * offset / exp value = my_list[index] value = my_dict['key'] Bad: exp = - 1.05 value = ( item_value / item_count ) * offset / exp value = (item_value/item_count)*offset/exp

reqparse.RequestParser() parser.add_argument('task') # Todo # shows a single todo item and lets you delete a todo item class Todo(Resource): def get(self, todo_id): abort_if_todo_doesnt_exist(todo_id) output values. This example assumes that bit 1 in the flags attribute signifies a “Normal” or “Urgent” item, and bit 2 signifies “Read” or “Unread”. These items might be easy to store in a bitfield, but for