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What's the difference between UTF-8 and UTF-8 without BOM?
...ple don't know about it.
BOM breaks scripts
Shell scripts, Perl scripts, Python scripts, Ruby scripts, Node.js scripts or any other executable that needs to be run by an interpreter - all start with a shebang line which looks like one of those:
#!/bin/sh
#!/usr/bin/python
#!/usr/local/bin/perl
#...
Ruby Gem install Json fails on Mavericks and Xcode 5.1 - unknown argument: '-multiply_definedsuppres
...ommand-line options as errors. This issue has been seen when building both Python native extensions and Ruby Gems, where some invalid compiler options are currently specified.
Projects using invalid compiler options will need to be changed to remove those options. To help ease that transition, the ...
Django filter versus get for single object?
... Everything is correct but maybe more info should be added to answer? 1. Python encourages try/except (see EAFP), that's why QS.get() is good. 2. Details matter: does "expecting only one" means always 0-1 objects, or it's possible to have 2+ objects and that case should be handled too (in this c...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...方测试
上图是服务器吞吐量分别用6个malloc实现的对比数据，可以看到tcmalloc和jemalloc最好(facebook在2011年的测试结果，tcmalloc这里版本较旧)。
4.3.2 mysql优化
测试环境：2x Intel E5/2.2Ghz with 8 real cores per socket，16 real cores， 开启hype...
C++ IDE for Linux? [closed]
...u end up not using them. Here’s just a small and biased selection:
For Python development, there’s PyCharm
For R, there’s RStudio
For JavaScript and TypeScript, there’s Visual Studio Code (which is also a good all-round editor)
And finally, many people love the Sublime Text editor for gene...
prototype based vs. class based inheritance
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@Stephano, They're not so distinct as all that: Python, Ruby, Smalltalk use dictionaries for method lookup, and javascript and Self have classes. To some extent, you could argue that the difference is just that the prototype-oriented languages are exposing their implement...
How to add an extra column to a NumPy array
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@JoshAdel: I tried your code on ipython, and I think there's a syntax error. You might want to try changing a = np.random.rand((N,N)) to a = np.random.rand(N,N)
– hlin117
Apr 11 '15 at 15:23
...
Regex to get string between curly braces
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...and Python just has slicing, which IMO is better than anything else :p.
– Grant Paul
Mar 3 '10 at 6:25
28
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Pandas - How to flatten a hierarchical index in columns
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The most pythonic way to do this to use map function.
df.columns = df.columns.map(' '.join).str.strip()
Output print(df.columns):
Index(['USAF', 'WBAN', 'day', 'month', 's_CD sum', 's_CL sum', 's_CNT sum',
's_PC sum', 'temp...
Interfaces — What's the point?
...s from IPizza is guaranteed to be orderable, as it has an Order() method.
Python is not statically-typed, therefore types are kept and looked up at runtime. So you can try calling an Order() method on any object. The runtime is happy as long as the object has such a method and probably just shrugs ...