May 10, 2010
Unchained melody
Collection concatenation can be done in many ways. A fairly underused way is to use the builtin chain method
Let's suppose you have to concatenate several collections objects, e.g.:
>>> a=range(3)
>>> b=set('ale')
>>> c=(a,b)
One easy way to do that is to create an empty list and use the extend method
>>> cat=[] >>> cat.extend(a) >>> cat.extend(b) >>> cat.extend(c) >>> cat [0, 1, 2, 'a', 'e', 'l', [0, 1, 2], set(['a', 'e', 'l'])]
But another elegant way do achieve the same result is to use the chain function from itertools
>>> from itertools import chain >>> chain(a,b,c) >>> cat=list(chain(a,b,c)) >>> cat [0, 1, 2, 'a', 'e', 'l', [0, 1, 2], set(['a', 'e', 'l'])]
This is especially useful when you have big amount of data because the result of the chain function is an iterator
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How to make your team mates think you are someway useful
Disclaimer: vi integralist should skip this post :)
During a technical meeting here in RedTurtle, me and my colleagues were exposing fancy stuffs about software development and I was amazed that the attention of my team mates was triggered by me using a self made Pydev template to insert the encoding on top of Python files.
So here, I am reporting this to the whole planet, hoping someone else will appreciate this simple time saving tip :)
Adding a new template in Pydev is really easy, just go to Window -> Preferences... A configuration window should appear (see image below).
Navigate the tree panel on the left: Pydev -> Editor -> Templates and add click on the New button.
Another window will appear, where you can insert a name for your template (in my case utf8), a description (Insert encoding in the file) and the text to be inserted when this template is used (# -*- coding: utf-8 -*-).
With this template configured, insert che utf-8 encoding in to a file is just as easy as typing ut[CTRL]+[SPACE].
