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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 ...
Regex to validate password strength
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codaddict's solution works fine, but this one is a bit more efficient: (Python syntax)
password = re.compile(r"""(?#!py password Rev:20160831_2100)
# Validate password: 2 upper, 1 special, 2 digit, 1 lower, 8 chars.
^ # Anchor to start of string.
(?=(?:[^A-Z]*[...
Why is C so fast, and why aren't other languages as fast or faster? [closed]
...aster because almost everything else is written in C.
Java is built on C, Python is built on C (or Java, or .NET, etc.), Perl is, etc. The OS is written in C, the virtual machines are written in C, the compilers are written in C, the interpreters are written in C. Some things are still written in...
How can I open a cmd window in a specific location?
... need to use cd /d. For example:
C:\Windows\System32\cmd.exe /K "cd /d H:\Python\"
(documentation)
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How can I strip all punctuation from a string in JavaScript using regex?
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Python's string.punctuation defines punctuation as: !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~ Which works better for me, so another alternative would be: replace(/['!"#$%&\\'()\*+,\-\.\/:;<=>?@\[\\\]\^_`{|}~']/g,""...
How to create dictionary and add key–value pairs dynamically?
...dict = {};
dict['key'] = "testing";
console.log(dict);
works just like python :)
console output:
Object {key: "testing"}
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random.seed(): What does it do?
I am a bit confused on what random.seed() does in Python. For example, why does the below trials do what they do (consistently)?
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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...