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Pandas conditional creation of a series/dataframe column

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Why were pandas merges in python faster than data.table merges in R in 2012?

...of the comparison to data.table as presented. UPDATE from data.table v1.8.0 released July 2012 Internal function sortedmatch() removed and replaced with chmatch() when matching i levels to x levels for columns of type 'factor'. This preliminary step was causing a (known) significa...
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Python __str__ versus __unicode__

...__str__() method: def __str__(self): return unicode(self).encode('utf-8') In 3.0, str contains characters, so the same methods are named __bytes__() and __str__(). These behave as expected. share | ...
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Can we append to a {% block %} rather than overwrite?

... answered Nov 12 '09 at 18:49 Steve LoshSteve Losh 18.5k22 gold badges4848 silver badges4444 bronze badges ...
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(![]+[])[+[]]… Explain why this works

...dization the feature was available in a good number of browsers (even in IE8 (standards mode)). share | improve this answer | follow | ...
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Auto-loading lib files in Rails 4

... ifyouseewendyifyouseewendy 6,58411 gold badge1818 silver badges2424 bronze badges ...
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How to cast/convert pointer to reference in C++

... @DrewNoakes stackoverflow.com/questions/2727834/… – David Heffernan Jun 16 '14 at 10:31  |  show 2 more comme...
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When does System.getProperty(“java.io.tmpdir”) return “c:\temp”

...erstood what I mean. – Zakaria Apr 18 '15 at 11:43 add a comment  |  ...
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Enums and Constants. Which to use when?

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How to convert an Array to a Set in Java

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