import struct  # 支持文件類型 # 用16進制字符串的目的是可以知道文件頭是多少字節 # 各種文件頭的長度不一樣，少半2字符，長則8字符 def typeList():   return {     "52617221": EXT_RAR,     "504B0304": EXT_ZIP}  # 字節碼轉16進制字符串 def bytes2hex(bytes):   num = len(bytes)   hexstr = u""   for i in range(num):     t = u"%x" % bytes[i]     if len(t) % 2:       hexstr += u"0"     hexstr += t   return hexstr.upper()  # 獲取文件類型 def filetype(filename):   binfile = open(filename, 'rb') # 必需二制字讀取   tl = typeList()   ftype = 'unknown'   for hcode in tl.keys():     numOfBytes = len(hcode) / 2 # 需要讀多少字節     binfile.seek(0) # 每次讀取都要回到文件頭，不然會一直往后讀取     hbytes = struct.unpack_from("B"*numOfBytes, binfile.read(numOfBytes)) # 一個 "B"表示一個字節     f_hcode = bytes2hex(hbytes)     if f_hcode == hcode:       ftype = tl[hcode]       break   binfile.close()   return ftype  if __name__ == '__main__':   print filetype(Your-file-path)