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Why do people say that Ruby is slow? [closed]
...s, but the language is very important too. Dynamic languages like Ruby and Python are slower than static typed languages simply because they require lots of type checking at runtime. Monkey patching is cool, but it is expensive.
– Wilson Freitas
Sep 11 at 19:09...
Determine if 2 lists have the same elements, regardless of order? [duplicate]
...are unique) as well as hashable (which strings and other certain immutable python objects are), the most direct and computationally efficient answer uses Python's builtin sets, (which are semantically like mathematical sets you may have learned about in school).
set(x) == set(y) # prefer this if e...
财务计算器拓展：复利计算、平均值、中位数、众数、方差计算 - App Invento...
...此扩展让您能够执行广泛的财务计算，从简单利息和复利到净现值和投资回报率。它还使您能够进行基本的统计计算，包括计算平均值、中位数、众数、方差等。无论您是在创建个人财务应用程序还是数据分析工具，此扩展都是...
Python Matplotlib Y-Axis ticks on Right Side of Plot
...new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f10354397%2fpython-matplotlib-y-axis-ticks-on-right-side-of-plot%23new-answer', 'question_page');
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Principal component analysis in Python
...
Months later, here's a small class PCA, and a picture:
#!/usr/bin/env python
""" a small class for Principal Component Analysis
Usage:
p = PCA( A, fraction=0.90 )
In:
A: an array of e.g. 1000 observations x 20 variables, 1000 rows x 20 columns
fraction: use principal components that...
Does order of where clauses matter in SQL?
...
ANSI SQL Draft 2003 5WD-01-Framework-2003-09.pdf
6.3.3.3 Rule evaluation order
...
Where the precedence is not determined by the Formats or by parentheses, effective evaluation of expressions is generally performed from left to right. However, it is implementation-de...
REST API Authentication
...orking Link from comments: https://www.ida.liu.se/~TDP024/labs/hmacarticle.pdf
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How does collections.defaultdict work?
I've read the examples in python docs, but still can't figure out what this method means. Can somebody help? Here are two examples from the python docs
...
How to deep copy a list?
...ist.
deepcopy(x, memo=None, _nil=[])
Deep copy operation on arbitrary Python objects.
See the following snippet -
>>> a = [[1, 2, 3], [4, 5, 6]]
>>> b = list(a)
>>> a
[[1, 2, 3], [4, 5, 6]]
>>> b
[[1, 2, 3], [4, 5, 6]]
>>> a[0][1] = 10
>>&g...
Iterate a list with indexes in Python
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python enumerate function will be satisfied your requirements
result = list(enumerate([1,3,7,12]))
print result
output
[(0, 1), (1, 3), (2, 7),(3,12)]
...