Python 常用库
difflib : SequenceMatcher、get_opcodes()
urllibs: Request、urllib2.urlopen()
os : os.path
sys : sys.stdout.write
datetime: datetime.now()
re : re.compile pat_obj.findall()
json: json.dumps(obj) json.loads(str)
logging: formatter, handler, logger
open() read() splitlines() split()
web: django