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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...
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...
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]*[...
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 ...
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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C++常用排序算法汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
...快速排序
* 不稳定排序，O{nlogn} ~ O{n^2}
* 适合排序大量数据
* 设最左边为基准数
* 右边往左找一个比基准数小的
* 左边往右找一个比基准数大的，和上一步交换
* 碰头后和基准数交换
*
* https://www.tsingfun.com
*************...
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,""...
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 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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