title: Addpath for Python like in Octave
body: <p>I am taking an introductory course in machine learning [<a href="https://www.coursera.org/learn/machine-learning/" rel="nofollow">0</a>], and it teaches Octave. The course introduces a function called addpath() that allows Octave to look in multiple directories for files [<a href="http://www.gnu.org/software/octave/doc/interpreter/Manipulating-the-Load-Path.html" rel="nofollow">1</a>].</p>
  
  <p>Does an equivalent function exist in Python? If not, is there a way to implement an equivalent function in Python?</p>