CONAN.conf._prior_value
=======================

.. py:function:: CONAN.conf._prior_value(str_prior)

   convert string prior into float/tuple

   :param str_prior: string representation of prior value e.g N(0.5,0.1) or F(0.5) or U(0.1,0.5,0.9) or LU(0.1,0.5,0.9)
   :type str_prior: str;

   :returns: **val** -- value of the prior
   :rtype: float, tuple;

   .. rubric:: Examples

   >>> _prior_value("N(0.5,0.1)")
   (0.5,0.1)
   >>> _prior_value("F(0.5)")
   0.5
   >>> _prior_value("U(0.1,0.5,0.9)")
   (0.1,0.5,0.9)
   >>> _prior_value("TN(0,1,0.2,0.1)")
   (0,1,0.2,0.1)