python - Integral Calculator wont work when given formula given more than 1 x in the formula -


so i'm working on integral calculator right now, , works well, although defining y x**2+x*2+2 stops working. prompts program work y = x**2+2 not y = x**2+x*2+2?

import math math  x0 = 0                                                                                       x1 = 0                                                                                        def func(y, x):                                                                                  return eval(y)  def func2(z, x):                                                                                 return eval(z)  def func3(c, d):             = 0.0                                                                                      in range(1, n+1):                                                                          x0 = + (i-1) * dx                                                                              ai = dx * (c + d)/ 2.                                                                    = + ai                                                                           return  y = str(raw_input("function 1: "))                                                       z = str(raw_input("function 2: "))                                            = float(input("left boundary: "))                                                      b = float(input("right boundary: "))                                                     dx = float(input("trapezoid width: "))                                                        n = int((b - a) / dx)                                                                 area2 = func3(func(y, x0), func(y, x1))                                                                              area3 = func3(func2(z, x0), func2(z, x1))  area4 = area2 - area3 if area4 < 0:     area4 = area3 - area2  print "area = ", area4                                                                   

import math math  x0 = 0                                                                                       x1 = 0                                                                  def f(function, x):    function = eval(function)    return function  def func3(b, a, func):            area = 0.0    dx = (b - a) / n                                                    in range(1, n+1):                                                                         x0 = + (i-1) * dx          x1 = + i*dx        ai = dx * (f(func, x0) + f(func, x1))/ 2.                                                                  area = area + ai                                                                          return area  y = str(input("function 1: "))                                                       z = str(input("function 2: "))                                            = float(input("left boundary: "))                                                      b = float(input("right boundary: "))                                                     n = int(input("trapezoid width: "))                                                         area2 = func3(b, a, y)                                                                              area3 = func3(b, a, z)  area4 = area2 - area3 if area4 < 0:    area4 = area3 - area2  print "area = ", area4

is more or less wanted do?


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