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Pandas dataframe get first row of each group
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>>> df.groupby('id').first()
value
id
1 first
2 first
3 first
4 second
5 first
6 first
7 fourth
If you need id as column:
>>> df.groupby('id').first().reset_index()
id value
0 1 firs...
How to open a file using the open with statement
I'm looking at how to do file input and output in Python. I've written the following code to read a list of names (one per line) from a file into another file while checking a name against the names in the file and appending text to the occurrences in the file. The code works. Could it be done bette...
TCP loopback connection vs Unix Domain Socket performance
Working on an Android and iOS based application which require communication with a server running in the same device. Currently using TCP loopback connection for communicating with App and Server (App written in user layer, server written in C++ using Android NDK)
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Is there an XSLT name-of element?
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This will give you the current element name (tag name)
<xsl:value-of select ="name(.)"/>
OP-Edit: This will also do the trick:
<xsl:value-of select ="local-name()"/>
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Rails: Adding an index after adding column
Suppose I created a table table in a Rails app. Some time later, I add a column running:
5 Answers
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Which is more efficient, a for-each loop, or an iterator?
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If you are just wandering over the collection to read all of the values, then there is no difference between using an iterator or the new for loop syntax, as the new syntax just uses the iterator underwater.
If however, you mean by loop the old "c-style" loop:
for(int i=0; i&l...
jQuery slide left and show
I extended the jQuery effects called slideRightShow() and slideLeftHide() with a couple functions that work similarly to slideUp() and slideDown() as seen below. However, I would also like to implement slideLeftShow() and slideRightHide() .
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JavaScript console.log causes error: “Synchronous XMLHttpRequest on the main thread is deprecated…”
...ou return HTML content like that via xhr, you will cause jQuery to make a call to get that script. That call happens with an async flag false since it assumes you need the script to continue loading.
In situations like this one you'd be better served by looking into a binding framework of some kin...
Custom HTTP Authorization Header
I was wondering if it's acceptable to put custom data in an HTTP authorization header. We're designing a RESTful API and we may need a way to specify a custom method of authorization. As an example, let's call it FIRE-TOKEN authentication.
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How does Python 2 compare string and int? Why do lists compare as greater than numbers, and tuples g
The following snippet is annotated with the output ( as seen on ideone.com ):
2 Answers
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