The following code causes Python 2.7.8 to lockup for ten minutes, then crash, in both Windows 7 and OS X:

from urllib import urlretrieve
urlretrieve('http://chromedriver.storage.googleapis.com/2.12/chromedriver_win32.zip', 'chromedriver_win32.zip')

Here's a thread on StackOverflow where I originally posted about this bug, assuming it was an issue in my code, before other people let me know that the problem wasn't my code, but with Python 2.7.8, on both Windows 7 and OS X, and that in older versions of Python, such as 2.7.6, the code works fine.

http://stackoverflow.com/questions/27025998/urllib-urlretreive-completely-locks-up-python