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How do I create test and train samples from one dataframe with pandas?
I have a fairly large dataset in the form of a dataframe and I was wondering how I would be able to split the dataframe into two random samples (80% and 20%) for training and testing.
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What characters are allowed in an email address?
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See RFC 5322: Internet Message Format and, to a lesser extent, RFC 5321: Simple Mail Transfer Protocol.
RFC 822 also covers email addresses, but it deals mostly with its structure:
addr-spec = local-part "@" domain ; global address
local-part ...
Get the length of a String
...ke this: func countElements<T>(x: T) -> T.IndexType.DistanceType and the return type doesn't accept the + operation.
– MarkAurelius
Jul 6 '14 at 6:21
291
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How does one reorder columns in a data frame?
...mns like so df[,c(1,2,3,4)].
Note the first comma means keep all the rows, and the 1,2,3,4 refers to the columns.
To change the order as in the above question do df2[,c(1,3,2,4)]
If you want to output this file as a csv, do write.csv(df2, file="somedf.csv")
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Uninstall / remove a Homebrew package including all its dependencies
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EDIT:
It looks like the issue is now solved using an external command called brew rmdeps or brew rmtree.
To install and use, issue the following commands:
$ brew tap beeftornado/rmtree
$ brew rmtree <package>
See the above link for more information and discussion.
Original answ...
Merge PDF files
...splitting documents page by page,
* merging documents page by page,
(and much more)
Here's a sample program that works with both versions.
#!/usr/bin/env python
import sys
try:
from PyPDF2 import PdfFileReader, PdfFileWriter
except ImportError:
from pyPdf import PdfFileReader, PdfFil...
How to reload a page using JavaScript
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what is the difference between location.reload() and window.location.reload() ?
– Raptor
Dec 20 '13 at 4:29
58
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How to convert SQL Query result to PANDAS Data Structure?
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Here's the shortest code that will do the job:
from pandas import DataFrame
df = DataFrame(resoverall.fetchall())
df.columns = resoverall.keys()
You can go fancier and parse the types as in Paul's answer.
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Can't install RMagick 2.13.1. Can't find MagickWand.h.
...://superuser.com/questions/361435/i-have-compiled-imagemagick-on-my-centos-and-rmagick-wont-install
I exported the imagemagick path by adding
$ export PKG_CONFIG_PATH="/opt/local/lib/pkgconfig:$PKG_CONFIG_PATH"
to my ~/.bash_profile, sourcing the new profile, then running:
gem install rmagick
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Remove items from one list in another
...ist in another" is certainly not equivalent to a set difference operation, and you should not misinform people by accepting this as the right answer!!!!
– user1935724
May 26 '16 at 3:58
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