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小米360同日竞技：智能手机血战再起 - 资讯 - 清泛网 - 专注C/C++及内核技术
...360同日竞技：智能手机血战再起5月6日，小米推出一款被称为“定位产品”的小米Note顶配版真机。同日，奇虎360也宣布重回智能手机市场，欲通过成本价销售和众筹模式杀出重围。5月6日，小米科技发布小米Note顶配版真机，预计...
Removing a list of characters in string
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If you're using python2 and your inputs are strings (not unicodes), the absolutely best method is str.translate:
>>> chars_to_remove = ['.', '!', '?']
>>> subj = 'A.B!C?'
>>> subj.translate(None, ''.joi...
how do you filter pandas dataframes by multiple columns
...r function using query in pandas. Here you have filtering of df results by all the kwargs parameters. Dont' forgot to add some validators(kwargs filtering) to get filter function for your own df.
def filter(df, **kwargs):
query_list = []
for key in kwargs.keys():
query_list.append(f...
Java内存泄露原因详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...对象的内存得不到及时释放，从而造成的内存空间的浪费称为内存泄露。内存泄露有时不严重且不易察觉，这样开发者就不知道存在内存泄露，但有时也会很严重，会提示你Out of memory。
那么，Java内存泄露根本原因是什么呢？...
Are HLists nothing more than a convoluted way of writing tuples?
I am really interested in finding out where the differences are, and more generally, to identify canonical use cases where HLists cannot be used (or rather, don't yield any benefits over regular lists).
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使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...网生态系统中发挥着重要作用。 BLE 以传统蓝牙技术（也称为经典蓝牙）为基础，同样是一种标准化的短距离无线通信协议，使来自多个供应商的设备能够发送和接收数据。 然而，BLE 更适合物联网设备，因为它支持低峰值和睡...
Undocumented NSURLErrorDomain error codes (-1001, -1003 and -1004) using StoreKit
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All error codes are on "CFNetwork Errors Codes References" on the documentation (link)
A small extraction for CFURL and CFURLConnection Errors:
kCFURLErrorUnknown = -998,
kCFURLErrorCancelled = -999,
kCFURLErrorBadU...
Python read-only property
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Generally, Python programs should be written with the assumption that all users are consenting adults, and thus are responsible for using things correctly themselves. However, in the rare instance where it just does not make sens...
warning about too many open figures
...the other axes untouched.
plt.clf() clears the entire current figure with all its axes, but leaves the window opened, such that it may be reused for other plots.
plt.close() closes a window, which will be the current window, if not specified otherwise. plt.close('all') will close all open figures....
Which characters make a URL invalid?
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@techiferous, Yeah, I forgot to allow "%" escaped characters. It should've looked more like: /^([!#$&-;=?-[]_a-z~]|%[0-9a-fA-F]{2})+$/ Was there anything else that you found it should've been accepting? (Just to be clear, that regex only checks ...