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NameError: name 'self' is not defined

...k fine), the above actually works as a workaround. It's still awkward that python chose to make self unavailable in a parameter list. – shevy Jan 2 '18 at 11:30 2 ...
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Making heatmap from pandas DataFrame

I have a dataframe generated from Python's Pandas package. How can I generate heatmap using DataFrame from pandas package. ...
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How to overcome “datetime.datetime not JSON serializable”?

...elds were represented as: {"$date": 1506816000000} If you want a generic Python solution for serializing datetime to json, check out @jjmontes' answer for a quick solution which requires no dependencies. As you are using mongoengine (per comments) and pymongo is a dependency, pymongo has built-...
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Windows应用程序异常:异常代码: 0xc0000005 - C/C++ - 清泛网 - 专注C/C++及内核技术

...溃,没有留下任何痕迹,追踪困难。这时可以打开Windows应用程序日志,查看崩溃信息。操作方法,我电脑右键管理:错 有时应用程序异常崩溃,没有留下任何痕迹,追踪困难。这时可以打开Windows应用程序日志,查看崩...
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stl 字符串std::string作为std::map主键key实例 - C/C++ - 清泛网 - 专注C/C++及内核技术

stl 字符串std::string作为std::map主键key实例本文通过一个实例介绍std::map字符串作为key常见用法,并使用find_if实现map按value值查找。代码如下: #include <map> #include <string> #include <algorithm> using namespace std; class map_value_finder {...
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js页面跳转window.location.href很多浏览器不支持解决方法 - C/C++ - 清...

js页面跳转window.location.href很多浏览器不支持解决方法在js里用window.location.href("xxxxx");来实现页面直接跳转功能。如:window.location.href(" index.html");IE内核浏览器木有问题。火狐...在js里用window.location.href("xxxxx");来实现页面直...
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php array为空判断 - C/C++ - 清泛网 - 专注C/C++及内核技术

php array为空判断如何判断PHP数组是否为空PHP判断数组为空首选方法:count($arr),size($arr);$arr= array("");echo count($arr);echo size($arr); 输出1...如何判断PHP数组是否为空 PHP判断数组为空首选方法:count($arr), size($arr); $arr= array(""); ec...
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C++在堆上申请二维数组 - C/C++ - 清泛网 - 专注C/C++及内核技术

C++在堆上申请二维数组假设要申请是double型大小m*n数组有如下方法方法一:优点:申请空间是连续 缺点:较难理解double (*d)[n] = new double[m][n]复...假设要申请是double型大小m*n数组 有如下方法 方法一:优点:申请空...
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高效使用STL容器小tip - C/C++ - 清泛网 - 专注C/C++及内核技术

高效使用STL容器小tip高效使用STL容器前提是不要以一种愚蠢方式去写代码,比如在循环里边每次都检查size()是不是0,每次都浪费线性时间。 看下边例子:...高效使用STL容器前提是不要以一种愚蠢方式去写代码,比如...
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csplitterwnd 窗口不能自适应解决方法 - C/C++ - 清泛网 - 专注C/C++及内核技术

csplitterwnd 窗口不能自适应解决方法if (!m_wndSplitterH.CreateView(0, 0, RUNTIME_CLASS(CGraphFrame), sizeDummy, pContext)) { TRACE0("Failed to cr...if (!m_wndSplitterH.CreateView(0, 0, RUNTIME_CLASS(CGraphFrame), sizeDummy, pContext)) { TRACE0("Failed to ...