[PYTHON] List memo writing part 2

Continuation of http://qiita.com/items/a8a46173c53830f7d465

Remove unnecessary elements

>>> fa = ["a", "b", None, "c", "e", None, None, None, "d"]
>>> [i for i in fa if i]
['a', 'b', 'c', 'e', 'd']

Get a list of files with the specified extension under a specific directory

>>> #Under the working directory`.eml`Get a list of files with the extension
>>> for root, dirs, files in os.walk(os.path.abspath(".")):
...     buff += [os.path.join(root, fname) for fname in files if os.path.splitext(os.path.join(root,fname))[1] == '.eml']
... 
>>> buff
['/path/to/1.eml', '/path/to/2.eml']

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