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def formel_analysieren(self, genauigkeit, startwert, endwert):
            self.x = np.arange(float(startwert),float(endwert),float(genauigkeit))

            x = self.x
            formula_raw = self.entry_funktion.get().replace('e^x', 'exp(x)')
            formula_raw_exp = formula_raw.replace('e^', 'exp')
            formula_list = re.split('(\W)', formula_raw_exp)
            formula_replace = [REPLACE_DIC.get(item,item) for item in formula_list]
            self.formula_finish = ''.join(formula_replace)
            form = parser.expr(self.formula_finish).compile()
            try:
                self.y = eval(form)
                self.legend = self.entry_funktion.get()
            except NameError:
                self.y = np.sin(self.x)
                self.legend = 'sin(x)'
            
            return (self.x,self.y,self.legend)
        
    
        
def plotten(self):
            self.formel_analysieren(self.get_genauigkeit(),self.get_startwert(),self.get_endwert())
            plt.clf()
            plt.plot(self.x,self.y, label=self.legend)
            plt.grid('on')
            plt.xlabel('x - Achse')
            plt.ylabel('y - Achse')
            legend = plt.legend()
            legend.draggable(state=True)
            plt.gcf().canvas.draw()
def get_genauigkeit(self):
        if self.entry_genauigkeit.get() is "":
            return 0.01
        else:
            return self.entry_genauigkeit.get()
def get_startwert(self):
        if self.entry_startwert.get() is "":
            return -5
        else:
            return self.entry_startwert.get()

def get_endwert(self):
        if self.entry_endwert.get() is "":
            return 5
        else:
            return self.entry_endwert.get()