计算python

Question

我将在python中计算一个双积分。这是我的代码：

from scipy.integrate import dblquad
X = Symbol('X')
Y = Symbol('Y')
x = 5.0 - 10.0 * X
y = 5.0 - 10.0 * Y
g1 = exp(-x * x / 2)
g2 = exp(-y * y / 2)
Z1 = g1 + 0.75 * g2 * (1 + g1)
Z = sqrt(Z1.diff(Y)**2 + Z1.diff(X)**2 + 1)
dblquad(lambda X, Y: Z, .1, .2, lambda x: .1, lambda x: .2)

  

错误：提供的函数不返回有效的浮点数。