def vmap(f, dic):
    return dict(zip(dic.keys(), map(f, dic.values())))


def can_str_emmbed(value):
    return isinstance(value, (int, str, float))


def str_emmbed(value):
    return "'{}'".format(value) if isinstance(value, str) else str(value)


def convert_oprand(x):
    from operands import ConstOperand, Underscore
    from formula import Formula

    if not issubclass(x.__class__, Formula):
        return ConstOperand(x)
    if isinstance(x, Underscore) and x.id == 0:
        return Underscore()
    return x

@@ -276,16 +276,28 @@
    from 
+pyscalambda.
 operands
@@ -338,16 +338,28 @@
    from 
+pyscalambda.
 formula 

fix paths