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How to shift a column in Pandas DataFrame
...n
1 206 214
2 226 234
3 245 253
4 265 272
So, run this script to get the expected output:
import pandas as pd
df = pd.DataFrame({'x1': ['206', '226', '245',' 265', '283'],
'x2': ['214', '234', '253', '272', '291']})
print(df)
df['x2'] = df['x2'].shift(1)
pri...
How do I make a column unique and index it in a Ruby on Rails migration?
I would like to make a column unique in Ruby on Rails migration script. What is the best way to do it? Also is there a way to index a column in a table?
...
How do I fix certificate errors when running wget on an HTTPS URL in Cygwin?
...h the command-line parameter --ca-directory=/usr/ssl/certs (best for shell scripts) or by adding ca_directory = /usr/ssl/certs to ~/.wgetrc file.
You can also fix that by running ln -sT /usr/ssl /etc/ssl as pointed out in another answer, but that will work only if you have administrative access to ...
Using ViewPagerIndicator library with Android Studio and Gradle
... Thank you. I did not want to add some random maven repository to my build script. This much better.
– Greg Ennis
Mar 13 '15 at 21:21
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How can I get the browser's scrollbar sizes?
...e height of a horizontal scrollbar, or the width of a vertical one, in JavaScript?
23 Answers
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How do I remove  from the beginning of a file?
... sequence of characters ($EF $BB $BF for UTF-8), so just remove them using scripts or configure the editor so it's not added.
From Removing BOM from UTF-8:
#!/usr/bin/perl
@file=<>;
$file[0] =~ s/^\xEF\xBB\xBF//;
print(@file);
I am sure it translates to PHP easily.
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How do I get ruby to print a full backtrace instead of a truncated one?
...
This produces the error description and nice clean, indented stacktrace:
begin
# Some exception throwing code
rescue => e
puts "Error during processing: #{$!}"
puts "Backtrace:\n\t#{e.backtrace.join("\n\t")}"
end
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Convert command line arguments into an array in Bash
How do I convert command-line arguments into a bash script array?
7 Answers
7
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Command-line svn for Windows?
...s perfect command line svn alternative, because the other linux tools, and scripting possibilities. You need to select subversion package in cygwin setup, to access svn commands.
– voji
Oct 25 '15 at 7:08
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Textarea to resize based on content length [duplicate]
...o a normal p or div. Not really a textarea but it will auto-resize without script.
.divtext {
border: ridge 2px;
padding: 5px;
width: 20em;
min-height: 5em;
overflow: auto;
}
<div class="divtext" contentEditable>Hello World</div>
...