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Pandas selecting by label sometimes return Series, sometimes returns DataFrame
In Pandas, when I select a label that only has one entry in the index I get back a Series, but when I select an entry that has more then one entry I get back a data frame.
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Why are joins bad when considering scalability?
...means smaller (and therefore faster) comparisons during the join operation
Indexes
Materialized/indexed views (think of this as a pre-computed join or managed de-normalization)
Computed columns. You can use this to hash or otherwise pre-compute the key columns of a join, such that what would be a co...
How to make good reproducible pandas examples
...]:
B
A
1 5
4 6
But say what's incorrect: the A column is in the index rather than a column.
do show you've done some research (search the docs, search StackOverflow), give a summary:
The docstring for sum simply states "Compute sum of group values"
The groupby docs don't give any...
How do I strip all spaces out of a string in PHP? [duplicate]
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Newbie question out of interest: What is the difference between space and whitespace? Isn't it the same?
– Kai Noack
Sep 12 '13 at 10:50
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Serving static files with Sinatra
...ill serve assets in public. For the empty route, you'll want to render the index document.
require 'rubygems'
require 'sinatra'
get '/' do
File.read(File.join('public', 'index.html'))
end
Routes should return a String which become the HTTP response body. File.read opens a file, reads the file,...
Replace a character at a specific index in a string?
I'm trying to replace a character at a specific index in a string.
8 Answers
8
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Checkout another branch when there are uncommitted changes on the current branch
...ded, removed, or altered in the work-tree as part of this process, and the index/staging-area is also untouched. (Caveat: it's safe when creating a new branch without changing the new branch's starting-point; but if you add another argument, e.g., git checkout -b newbranch different-start-point, th...
URL rewriting with PHP
...ng in your .htaccess instead: (note the leading slash)
FallbackResource /index.php
This will tell it to run your index.php for all files it cannot normally find in your site. In there you can then for example:
$path = ltrim($_SERVER['REQUEST_URI'], '/'); // Trim leading slash(es)
$elements =...
Google Maps API - Get Coordinates of address
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@n00b: I initially mis-read your question. You're looking for Geocoding, not Reverse Geocoding. Nevertheless, you can still do it with the Google Web Services API.
– Daniel Vassallo
Sep 6 '10 at 16:41
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What makes a SQL statement sargable?
...CT ... FROM ...
WHERE Year(myDate) = 2008
The SQL optimizer can't use an index on myDate, even if one exists. It will literally have to evaluate this function for every row of the table. Much better to use:
WHERE myDate >= '01-01-2008' AND myDate < '01-01-2009'
Some other examples:
Bad: ...