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What is the most efficient way to loop through dataframes with pandas? [duplicate]
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Pandas is based on NumPy arrays.
The key to speed with NumPy arrays is to perform your operations on the whole array at once, never row-by-row or item-by-item.
For example, if close is a 1-d array, and you want the day-over-day percen...
Eclipse returns error message “Java was started but returned exit code = 1”
...erver_10.3
So a 32-bit Java for a 32-bit Eclipse, but still exit code 1. Based on all answers I had seen here, and the only change being a new laptop with Windows 10, the only possible explanation was that the new OS and the Eclipse were disagreeing on something. So I started playing around with e...
What are allowed characters in cookies?
...page is used (locale-specific and never UTF-8);
Firefox (and other Mozilla-based browsers) use the low byte of each UTF-16 code point on its own (so ISO-8859-1 is OK but anything else is mangled);
Safari simply refuses to send any cookie containing non-ASCII characters.
so in practice you cannot u...
How to prevent favicon.ico requests?
...sers. I tested Safari, Chrome and Firefox:
<link rel="icon" href="data:;base64,=">
I left out the "shortcut" name from the "rel" attribute value since that's only for older IE and versions of IE < 8 doesn't like dataURIs either. Not tested on IE8.
UPDATE 2:
If you need your document to val...
Two-way encryption: I need to store passwords that can be retrieved
...json).
After you have successfully encrypted using mcrypt, run it through base64_encode and then convert it to hex code. Once in hex code it's easy to transfer in a variety of ways.
$td = mcrypt_module_open('tripledes', '', 'ecb', '');
$iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RA...
高并发服务端分布式系统设计概要 - C/C++ - 清泛网 - 专注C/C++及内核技术
...好了，现在我们的“山推”系统设计完成了，但是要将它编码实现，还有很远的路要走，细枝末节的问题也会暴露更多。如果该系统用于线上计算，如有大量的Map-Reduce运行于group中，系统将会更复杂，因为此时不光考虑的数据的...
JavaScript/jQuery to download file via POST with JSON data
I have a jquery-based single-page webapp. It communicates with a RESTful web service via AJAX calls.
14 Answers
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How long should SQL email fields be? [duplicate]
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Some statistical data may shed some light on the issue. We analyzed a database with over 10 million Email addresses. These addresses are not confirmed so there are invalid ones. Here are some interesting facts,
The longest valid one is 89.
There are hundreds longer ones up to the limit of our col...
How to pass html string to webview on android
..."text/html; charset=utf-8", "UTF-8");
Or You can try
webview.loadDataWithBaseURL(null, data, "text/html", "utf-8", null);
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How can I install pip on Windows?
...llation (C:\Python27\Scripts) or add that directory, as well as the Python base installation directory to your %PATH% environment variable.
Install pip using the newly installed setuptools: easy_install pip
The last step will not work unless you're either in the directory easy_install.exe is locat...