fd.download(['http://openclassroom.stanford.edu/MainFolder/VideoPage.php?course=PracticalUnix&video=intro-environment&speed=100'])
self.assertTrue(os.path.exists(filename))
md5_for_file = _file_md5(filename)
fd.download(['http://openclassroom.stanford.edu/MainFolder/VideoPage.php?course=PracticalUnix&video=intro-environment&speed=100'])
self.assertTrue(os.path.exists(filename))
md5_for_file = _file_md5(filename)