python返回汉字的首字母

def get_first_letter(char):

   char=char.encode('GBK')

   

   if char<b"xb0xa1" or char>b"xd7xf9":

       return ""

   if char<b"xb0xc4":

       return "a"

   if char<b"xb2xc0":

       return "b"

   if char<b"xb4xed":

       return "c"

   if char<b"xb6xe9":

       return "d"

   if char<b"xb7xa1":

       return "e"

   if char<b"xb8xc0":

       return "f"

   if char<b"xb9xfd":

       return "g"

   if char<b"xbbxf6":

       return "h"

   if char<b"xbfxa5":

       return "j"

   if char<b"xc0xab":

       return "k"

   if char<b"xc2xe7":

       return "l"

   if char<b"xc4xc2":

       return "m"

   if char<b"xc5xb5":

       return "n"

   if char<b"xc5xbd":

       return "o"

   if char<b"xc6xd9":

       return "p"

   if char<b"xc8xba":

       return "q"

   if char<b"xc8xf5":

       return "r"

   if char<b"xcbxf9":

       return "s"

   if char<b"xcdxd9":

       return "t"

   if char<b"xcexf3":

       return "w"

   if char<b"xd1x88":

       return "x"

   if char<b"xd4xd0":

       return "y"

   if char<b"xd7xf9":

       return "z"