林培恒 wrote: > How can I get ASCII for alphabet and number, such as 'a' and '1'. I can get ASCII for character naturally in C but I don't how to in Python. You can get the character codes using ord(): In [1]: ord('a') Out[1]: 97 In [2]: ord('1') Out[2]: 49 The inverse function is chr(): In [3]: chr(97) Out[3]: 'a' Kent