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cartesian product in pandas
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If you have a key that is repeated for each row, then you can produce a cartesian product using merge (like you would in SQL).
from pandas import DataFrame, merge
df1 = DataFrame({'key':[1,1], 'col1':[1,2],'col2':[3,4]})
df2 = DataFrame({'key':[1,1], 'col3':[5...
Unmarshaling nested JSON objects
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@CalebThompson The structure for XML and JSON are completely different, even if the simple cases look alike. The content of a XML tag is kinda:(An ordered map of sub-tags OR Text) AND an unordered map of attributes. JSON is much more like a Go struct. So ...
How to print matched regex pattern using awk?
Using awk , I need to find a word in a file that matches a regex pattern.
8 Answers
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How can I list the contents of a directory in Python?
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import os
os.listdir("path") # returns list
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Android存储系统基础知识：内部存储，外部存储，App特定目录 ASD(app speci...
...识：内部存储，外部存储，App特定目录 ASD(app specific directory) 及 getASD代码实现
Android存储系统基础知识
从 Android 的角度来看 → 内部存储和 → 外部存储：
绝对路径(Absolute path) │ 相对...
CodeIgniter removing index.php from url
...php"
to
$config['index_page'] = ""
In some cases the default setting for uri_protocol does not work properly.
Just replace
$config['uri_protocol'] ="AUTO"
by
$config['uri_protocol'] = "REQUEST_URI"
.htaccess
RewriteEngine on
RewriteCond $1 !^(index\.php|resources|robots\.txt)
RewriteCo...
Array Size (Length) in C#
... number of elements of a.
If b is a rectangular multi-dimensional array (for example, int[,] b = new int[3, 5];)
b.Rank
will give the number of dimensions (2) and
b.GetLength(dimensionIndex)
will get the length of any given dimension (0-based indexing for the dimensions - so b.GetLength(0) is...
Centering a view in its superview using Visual Format Language
I just started learning AutoLayout for iOS and had a look at Visual Format Language.
14 Answers
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UIView Hide/Show with animation
...y to do this just using the UIView transition method without needing to import QuartzCore. You can just say:
Objective C
[UIView transitionWithView:button
duration:0.4
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
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Installing python module within code
...l a package from PyPi straight within my script.
Maybe there's some module or distutils ( distribute , pip etc.) feature which allows me to just execute something like pypi.install('requests') and requests will be installed into my virtualenv.
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