Help improve program for parsing simple rules

[John Machin]

On Apr 17, 1:57 am, prueba... at latinmail.com wrote:

> COMP_REPLACERS={'LT':'<', 'GT':'>', 'LE':'<=', 'GE':'>=', '=':'==',
> '=>':'=>', '=<':'=<'}

What do the '=>' and '=<' represent? Why are you replacing each by
itself?