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How to check if a column exists in Pandas
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To check if one or more columns all exist, you can use set.issubset, as in:
if set(['A','C']).issubset(df.columns):
df['sum'] = df['A'] + df['C']
As @brianpck points out in a comment, set([]) can alternatively be constructed with curly...
vim repeat find next character 'x'
... and ;), to a different character than the repetition of an edit (.). This allows you to do fast searches and changes to the search results. If you want to replace some + in a line with * you could do something like this (skipping some characters and replacing others): f+r*;.;;.;.;;;.
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Link to add to Google calendar
...p;location=[location]
&trp=false
&sprop=
&sprop=name:"
target="_blank" rel="nofollow">Add to my calendar</a>
Here's a form which will help you construct such a link if you want (mentioned in earlier answers):
https://support.google.com/calendar/answer/3033039
Edit: This link ...
Comma separator for numbers in R?
...rs are encoded with the minimum number of decimal places needed to display all the elements to at least the digits significant digits. However, if all the elements then have trailing zeroes, the number of decimal places is reduced until nsmall"
– micstr
Dec 10 ...
Django - iterate number in for loop of a template
...e dictionary then not only first and last iteration can be controlled, but all index can be controlled. example:
{% for key, value in DictionaryResult.items %}
<tr align="center">
{% for project_data in value %}
{% if forloop.counter <= 13 %} <!-- Here you can control ...
How can I tell Rails to use RSpec instead of test-unit when creating a new Rails app?
I have test-unit installed and rspec installed (along with -core , -expectations , -mocks and -rails version 2.6.x). When I run the command rails new foo , it uses test-unit to generate the test stub files instead of rspec .
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In JavaScript, does it make a difference if I call a function with parentheses?
I noticed a difference when calling a function with empty parentheses, or without any parentheses at all. However, I am not passing any arguments to the function so I wondered, what would be the difference between:
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How do I enable language extensions from within GHCi?
... -XRankNTypes. The -X part is a compiler switch, by the way, extension is called just RankNTypes.
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Symbolic link to a hook in git
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All this worked for me in the end. The only difference is that I am linking to my own prepare-commit-msg. The problem is if I am editing the commit message using nano, then Ctl+X out to abort, git still completes a commit any...
Vim - how to run a command immediately when starting vim?
...itializations
9. Read the viminfo file
10. Read the quickfix file
11. Open all windows
12. Execute startup commands
As you can see, your .vimrc will be loaded before plugins. If you put :FindFileCache . in it an error will occur, since that command does not exist yet. (It will exist once the plugi...