假设我有一个Bookitem,我需要在解析阶段和细节阶段向它添加信息
def parse(self, response)
data = json.loads(response)
for book in data['result']:
item = BookItem();
item['id'] = book['id']
url = book['url']
yield Request(url, callback=self.detail)
def detail(self,response):
hxs = HtmlXPathSelector(response)
item['price'] = ......
#I want to continue the same book item as from the for loop above
按原样使用代码会导致详细信息阶段中的未定义项.如何将项目传递给细节？细节(自我,响应,项目)似乎不起作用.
Apple应用内购买transaction_ids是否仅对于给定的应用或产品是唯一的,还是它们实际上是全球唯一的？
示例:如果1000000019169002应用程序A存在transaction_id(例如),那么对于第二个应用程序B,是否可以针对不同的事务再次返回该transaction_id？
我执行时遇到以下错误:
$ python manage.py schemamigration myapp --initial
似乎抱怨这条线:
audio_file = models.FileField(_("Audio file"), upload_to=get_audio_upload_path)
我不确定我做错了什么.请帮忙.
Traceback (most recent call last):
File "/Users/home/Desktop/Web Development/Aptana Studio 3.0/musicproject/src/manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line
utility.execute()
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/base.py", line 196, in run_from_argv
self.execute(*args, **options.__dict__)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/base.py", line 231, in execute
self.validate()
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/base.py", line 266, in validate
num_errors = get_validation_errors(s, app)
File "/Users/home/virtualenv/venv/lib/python2.7/site-packages/django/core/management/validation.py", line 30, in get_validation_errors
for (app_name, error) in get_app_errors().items():
File …我使用MongoDB并通过pymongo连接到它.这是我的代码:
>>> import pymongo
>>> con=pymongo.Connection('localhost',27017)
>>> con.database_names()
['local', 'bookdb']
>>> con.close()
>>> con.database_names()
['local', 'bookdb']
我con.close()用来断开与MongoDB的连接,但在那之后,我仍然可以 con.database_names() 用来查看数据库列表.为什么？它永远不会断开与MongoDB服务器的连接.为什么close()不行？
难道Event和Lock做这些场景是一回事吗？
class MyThread1(threading.Thread):
def __init__(event):
self.event = event
def run(self):
self.event.wait()
# do something
self.event.clear()
另一个:
class MyThread2(threading.Thread):
def __init__(lock):
self.lock = lock
def run(self):
self.lock.acquire()
# do something
self.lock.release()
我正在尝试使用xlwt和row.(i).高,但我没有结果.
我的代码:
import xlwt
book = xlwt.Workbook(encoding='latin-1')
sheet = sheet.add_sheet('KPI.TiempoRespuesta',cell_overwrite_ok=True)
sheet.write(1, 4, "BLABLABLABLABLABLABLABLABLABLABLABLA")
sheet.row(4).height = 256*20
book.save("book.xls")
我想增加单元格高度; /,但行.(i).高不做任何事情