'Generates a data-if condition to handle the plural toggle.
If we have a string like:
<p>...</p>
That we want to turn into:
<p data-if="isSingular(NUM)">...</p>
<p data-else>...</p>
This function returns the ???, which in this case is an index into
the ngetpos array.'

def get_condition(self, key):

    return (self._ngetpos_condition % key)
