Questions tagged «python»

我正在尝试使用Python Pandas查找具有最大值的Country＆Place。 这将返回最大值： data.groupby(['Country','Place'])['Value'].max() 但我怎么得到相应Country和Place的名字吗？

117 python  pandas  dataframe  max 

我有一个base64格式的字符串，它表示PNG图像。有没有一种方法可以将该图像保存为PNG文件到文件系统？ 我使用flex对图像进行编码。其实这就是我在服务器上得到的（在任何建议的方法后都看不到任何图像:(） 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117 python  image 

subprocess.Popen()和之间有什么区别os.system()？

117 python  subprocess  system 

有时，使用默认参数（一个空列表）似乎很自然。但是Python在这些情况下会产生意外的行为。 例如，如果我有一个功能： def my_func(working_list = []): working_list.append("a") print(working_list) 第一次调用它时，默认设置将起作用，但是此后的调用将更新现有列表（每个调用一个“ a”）并打印更新的版本。 那么，什么是获得我想要的行为的Python方法（每次调用都会有一个新列表）？

117 python  python-3.x 

按照目前的情况，这个问题不适合我们的问答形式。我们希望答案得到事实，参考或专业知识的支持，但是这个问题可能会引起辩论，争论，民意调查或扩展讨论。如果您认为此问题可以解决并且可以重新提出，请访问帮助中心以获取指导。 7年前关闭。 在python中，您通常使用PEP 8-Python代码样式指南作为您的编码标准/准则吗？您还有其他更喜欢的正式标准吗？

116 python  coding-style 

我试图了解Python嵌套类中的作用域。这是我的示例代码： class OuterClass: outer_var = 1 class InnerClass: inner_var = outer_var 类的创建未完成，并且出现错误： <type 'exceptions.NameError'>: name 'outer_var' is not defined 尝试inner_var = Outerclass.outer_var不起作用。我得到： <type 'exceptions.NameError'>: name 'OuterClass' is not defined 我正在尝试从访问静态outer_var信息InnerClass。 有没有办法做到这一点？

116 python  class  scope  nested  inner-classes 

我试图使用text.translate()Python 3.4 从给定的字符串中删除不需要的字符。 最小的代码是： import sys s = 'abcde12345@#@$#%$' mapper = dict.fromkeys(i for i in range(sys.maxunicode) if chr(i) in '@#$') print(s.translate(mapper)) 它按预期工作。但是，在Python 3.4和Python 3.5中执行相同的程序会产生很大的不同。 计算时间的代码是 python3 -m timeit -s "import sys;s = 'abcde12345@#@$#%$'*1000 ; mapper = dict.fromkeys(i for i in range(sys.maxunicode) if chr(i) in '@#$'); " "s.translate(mapper)" Python 3.4程序花费1.3毫秒，而Python 3.5中的同一程序仅花费26.4μs。 …

116 python  string  python-3.x  python-internals  python-3.5 

这是一个..徒劳的问题，但是BuildBot的输出并不是特别好看。 例如，相比 phpUnderControl 詹金斯 哈德森 CruiseControl.rb ..及其他，BuildBot看起来..古老 我目前正在与Hudson一起玩，但是它是非常以Java为中心的（尽管使用本指南，我发现它比BuildBot容易设置，并提供了更多信息） 基本上：是否有任何针对python的持续集成系统，它们会生成许多闪亮的图形等？ 更新：自从这次以来，Jenkins项目已将Hudson替换为软件包的社区版本。原始作者也已移至该项目。Jenkins现在是Ubuntu / Debian，RedHat / Fedora / CentOS等上的标准软件包。以下更新本质上仍然正确。詹金斯做到这一点的起点是不同的。 更新：尝试了几种选择之后，我认为我会坚持使用哈德森。完整性很好而且很简单，但是非常有限。我认为 Buildbot更适合拥有多个构建从属，而不是像我在使用它那样在一台机器上运行的所有东西。 将Hudson设置为Python项目非常简单： 从http://hudson-ci.org/下载Hudson 运行它 java -jar hudson.war 打开Web界面的默认地址为 http://localhost:8080 转到管理哈德森，插件，单击“更新”或类似内容 安装Git插件（我必须git在Hudson全局首选项中设置路径） 创建一个新项目，输入存储库，SCM轮询间隔等 如果尚未安装，请nosetests通过安装easy_install 在构建步骤中，添加 nosetests --with-xunit --verbose 选中“发布JUnit测试结果报告”并将“测试报告XML”设置为 **/nosetests.xml 这就是全部。您可以设置电子邮件通知，这些插件值得一看。我目前正在使用一些Python项目： SLOCCount插件可以计算代码行（并绘制图形！）-您需要单独安装sloccount 违反解析PyLint输出（您可以设置警告阈值，绘制每个构建中违反次数的图表） Cobertura可以解析coverage.py的输出。Nosetest可以在运行测试时使用收集覆盖范围nosetests --with-coverage（将输出写入**/coverage.xml）

116 python  jenkins  continuous-integration  buildbot 

您能否建议使用numpy / scipy中的模块函数在一维numpy数组中找到局部最大值/最小值？显然，最简单的方法是看一下最近的邻居，但我想拥有一个被接受的解决方案，它是numpy发行版的一部分。

116 python  numpy 

关闭。此问题不符合堆栈溢出准则。它当前不接受答案。 想改善这个问题吗？更新问题，使其成为Stack Overflow 的主题。 5年前关闭。 改善这个问题 我需要为Python 2.7下载它，但似乎找不到它...

116 python  winapi 

我正在寻找一个在Django日期之间进行选择的查询。 我知道如何使用原始SQL轻松做到这一点，但是如何使用Django ORM做到这一点呢？ 这是我要在查询中添加30天之间的日期的地方： start_date = datetime.datetime.now() + datetime.timedelta(-30) context[self.varname] = self.model._default_manager.filter( current_issue__isnull=True ).live().order_by('-created_at')

116 python  django 

我正在编写一个GUI应用程序，该应用程序通过Web连接定期检索数据。由于此检索需要一段时间，因此会导致UI在检索过程中无响应（无法拆分成较小的部分）。这就是为什么我想将Web连接外包给单独的工作线程。 [是的，我知道，现在我有两个问题。] 无论如何，该应用程序使用PyQt4，所以我想知道更好的选择是：使用Qt的线程还是使用Python threading模块？各自的优点/缺点是什么？还是您有完全不同的建议？ 编辑（赏金）：虽然在我的特定情况下，解决方案可能会使用非阻塞网络请求，例如Jeff Ober和LukášLalinský建议的（所以基本上将并发性问题留给了网络实现），但我仍然想要更多深入回答一般问题： 与本地Python线程（来自threading模块）相比，使用PyQt4（即Qt）线程有什么优缺点？ 编辑2：谢谢大家的回答。尽管没有达成100％的协议，但似乎普遍的共识是答案是“使用Qt”，因为这样做的优点是可以与库的其余部分集成，而不会造成任何实际的缺点。 对于希望在这两种线程实现之间进行选择的任何人，我强烈建议他们阅读此处提供的所有答案，包括方丈链接到的PyQt邮件列表线程。 我考虑了一些悬赏的答案；最后，我选择了方丈作为非常相关的外部参考；然而，这是一个密切的电话。 再次感谢。

116 python  multithreading  pyqt 

我有一个托管在GitHub上的项目。为此，我使用Markdown语法编写了自述文件，以便在GitHub上很好地格式化它。 由于我的项目使用Python，因此我还计划将其上传到PyPi。PyPi上用于README的语法为reStructuredText。 我希望避免处理两个包含大致相同内容的自述文件。因此，我搜索了RST（或相反）转换器的降价促销，但找不到任何商品。 我看到的另一个解决方案是执行markdown / HTML，然后执行HTML / RST转换。我在这里和这里都找到了一些资源，所以我猜应该是可行的。 您有什么想法可以更好地适合我的工作吗？

116 python  github  markdown  restructuredtext  pypi 

我正在启动新的Google App Engine应用程序，目前正在考虑两个框架：Flask和webapp2。我对以前的App Engine应用程序使用的内置webapp框架感到非常满意，因此我认为webapp2会更好，并且不会有任何问题。 但是，Flask有很多不错的评论，我真的很喜欢Flask的方法以及到目前为止我在文档中已经读过的所有东西，我想尝试一下。但是我有点担心Flask会遇到的局限性。 因此，问题是- 您是否知道Flask可能会带入Google App Engine应用程序的任何问题，性能问题，限制（例如，路由系统，内置授权机制等）？“问题”是指我无法在几行代码（或任何合理数量的代码和工作量）中解决的问题，或者是完全不可能的事情。 还有一个后续问题：尽管我可能会遇到任何问题，但您认为Flask中是否有任何杀手级功能可以打动我，让我使用它？

116 python  google-app-engine  flask  webapp2 

我正在使用Django Rest Framework。而且我不断出错 Exception Type: TemplateDoesNotExist Exception Value: rest_framework/api.html 我不知道我怎么了。这是我第一次尝试使用REST Framework。这是代码。 views.py import socket, json from modules.data.models import * from modules.utils import * from rest_framework import status from rest_framework.decorators import api_view from rest_framework.response import Response from modules.actions.serializers import ActionSerializer @api_view(['POST']) @check_field_exists_wrapper("installation") def api_actions(request, format = None): action_type = request.POST['action_type'] if …

116 python  django  django-rest-framework