[Python-ideas] Inline Functions - idea

[Andrew Barnert]

On Feb 10, 2014, at 10:49, Alex Rodrigues <lemiant at hotmail.com> wrote:

The only reason you think you need more powerful lambdas and inline functions is that you're ignoring features Python already has. For example;

> def is_symmetric(matrix):
>  element_wise(lambda: if matrix[i][j] != matrix[j][i]: return False)
>  return True

This requires full statements as lambdas, and inline functions, and some kind of "multi-level return", where the implicit lambda return is level -1 so an explicit one returns from the outer (dynamic) scope, right?

But element_wise is just a genexpr in disguise. And with the builtin all function you don't need early return. And that early return was the only reason your if needed to be a statement. So:

 return all(matrix[i][j] == matrix[j][i] for i, j in element_wise(matrix))

And this element_wise isn't anything magic, it's just product(range(len(matrix)), repeat=2).