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# coding=utf-8
from .simplenode import SimpleNode
from gettext import gettext as _
import math
class E(SimpleNode):
"""Node representing e."""
CLASS = "e"
background = SimpleNode.loadbackground("e.svg")
title = _("e")
description = _(u"e is an irrational number such that the derivative "
u"of f(x) = e ** x is f(x).\n"
u"e is approximately 2.71828")
def __call__(self, x):
"""Returns e."""
return math.e
def get_equation_string(self, variable):
"""Returns e, ignoring the variable."""
return "e"
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