urlib - to use or not to use ( for web scraping )?

[snippsat]

If I understand well os.path.basename is used to get the original name of the image, we can do without it,

Yes it was just to show that option.
A tips get used to test stuff out interactive bye taking parts of code out,a better REPL like IPython or ptpython(what i use) also help.

>>> import os
>>> 
>>> image_location = 'http://www.pythonscraping.com/sites/default/files/lrg_0.jpg'
>>> os.path.basename(image_location)
'lrg_0.jpg'
>>> 
>>> help(os.path.basename)
Help on function basename in module ntpath:

basename(p)
    Returns the final component of a pathname