我在一条线上得到了 n 个点及其位置。我需要计算每对点之间的距离之和。是否可以实现复杂度为 O(n) 的操作？
示例：给定三个点，其坐标为 a(-1)、b(-3)、c(3)。所需金额： |-1 + 3| + | - 1 - 3| + |-3 - 3 | = 12
请帮我。
我正在制作网页。有两种观点。Index和Detail。在索引中，我使用response.set_cookie('key', key)where 为用户设置cookie response = HttpResponseRedirect(file_url)。在detail功能，当我尝试利用cookie的获取数据
if 'key' not in request.cookies:
key = request.COOKIES['key']
我收到错误消息：'WSGIRequest' object has no attribute 'cookies'。详细的错误链接：http : //dpaste.com/1P017V6
请帮我！。提前致谢。
我正在使用python-C api重写一个最初用C编写的python模块到Cython.模块也使用NumPy.该项目的一个主要挑战是保持模块的当前速度,并且它应该适用于所有Numpy数据类型.我想使用融合数据类型使其通用但我担心,因为它对性能的瓶颈影响.有没有其他技术可以用来代替融合类型,我可以使用它来实现速度和通用代码.
我想在我的应用程序中使用这个应用程序https://github.com/benliles/django-chance.我的Django版本是1.9.我收到以下错误:
python manage.py runserver
Unhandled exception in thread started by <function wrapper at 0x7f4931ce85f0>
Traceback (most recent call last):
File "/home/bewithaman/Projects/ems/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper
fn(*args, **kwargs)
File "/home/bewithaman/Projects/ems/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run
autoreload.raise_last_exception()
File "/home/bewithaman/Projects/ems/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 249, in raise_last_exception
six.reraise(*_exception)
File "/home/bewithaman/Projects/ems/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper
fn(*args, **kwargs)
File "/home/bewithaman/Projects/ems/local/lib/python2.7/site-packages/django/__init__.py", line 18, in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/bewithaman/Projects/ems/local/lib/python2.7/site-packages/django/apps/registry.py", line 85, in populate
app_config = AppConfig.create(entry)
File "/home/bewithaman/Projects/ems/local/lib/python2.7/site-packages/django/apps/config.py", line 90, in create
module = import_module(entry)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, …我正在尝试在Ubuntu 12上构建AMAROK.我已经安装了Qt5,但是我收到以下错误:
CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
Could NOT find Qt4: Found unsuitable version "4.8.2", but required is at
least "4.8.3" (found /usr/bin/qmake)
Call Stack (most recent call first):
/usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:313 (_FPHSA_FAILURE_MESSAGE)
/usr/share/cmake-2.8/Modules/FindQt4.cmake:1393 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:83 (find_package)