Copynum=ord(char)
char=chr(num)

For example,

Copy>>> ord('a')
97
>>> chr(98)
'b'

You can read more about the built-in functions in Python here.

Answer from Adam Matan on Stack Overflow
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This work is licensed under the Creative Commons Attribution-ShareAlike License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/ ASCII Conversion Chart.doc Copyright ยฉ 2008, 2012 Donald Weiman 22 March 2012