#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2017 lafrite <lafrite@Poivre>
#
# Distributed under terms of the MIT license.

"""
Expression

"""



class Expression(object):

    """
    Expression class

    """

    def __init__(self,):
        """
        """
        pass

    @classmethod
    def from_str(cls,  string):
        """ Initiate the expression from a string

        :param string: TODO
        :returns: TODO

        """
        pass

    @classmethod
    def random(self, template, conditions = [], shuffle = False):
        """ Initiate randomly the expression 

        :param template: the template of the expression
        :param conditions: conditions on randomly generate variable
        :param shuffle: allowing to shuffle the tree
        :returns: TODO

        """
        pass


# -----------------------------
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