safe eval of moderately simple math expressions

[Joel Hedlund]

Peter Otten wrote:
>> def is_it_safe(source):
>>      return "_" not in source and r'\' not in source
> 
>>>> "".join(map(chr, [95, 95, 110, 111, 95, 95]))
> '__no__'

But you don't have access to neither map or chr?

/Joel