Beetle on carpet

Dragonfly

Extract Initials from Names using Python

>>> name = "Rizauddin Saian"
>>> ' '.join([n[0] + "." for n in name.split()])
'R. S.'

[nltk_data] Error loading all: HTTP Error 401: Authorization Required

If you get the following error, when downloading the corpus for NLTK,

[nltk_data] Error loading all: HTTP Error 401: Authorization Required

you need to update the current data server setting in "/usr/lib/python2.7/dist-packages/nltk/downloader.py" file on line 370 from

DEFAULT_URL = 'http://nltk.googlecode.com/svn/trunk/nltk_data/index.xml'

to

DEFAULT_URL = "http://nltk.github.com/nltk_data/"

How to hide the header of an embedded Google Drive (Docs) Spreadsheet as html

Replace

&widget=true

with

&chrome=false

Ubuntu: How to enable spellchecker in LyX

1. Open the Terminal and install Enchant.
   
   sudo apt-get install enchant
2. Open LyX and select Tools > Preferences > Language Settings > Spellchecker
3. Select Enchant for Spellchecker Engine.
4. Click on Apply, Save and finally Close.

LaTeX: How to add vertical bar with evaluation or limit

$$\frac{\partial f}{\partial x\partial y}\bigg\vert_{x=y=0}$$