User blog comment:KthulhuHimself/The Rho function./@comment-1605058-20151028141755

I believe this function needs some further specification as to make it well-defined. I don't know Python, so what I describe might not be possible, and I won't be giving exact code for the situation.

The thing is, you allow your programs to have unlimited number of blank characters. This can be exploited as follows: suppose we define a string variable, and we define it to be long string of whitespaces (so it looks like "              "), and then we count the number of spaces in this string and output it. This can be done in a bounded number of non-blank characters, say N, and this would make Rh(N) to be undefined - with enough whitespaces in the string we can output as large number as we want.