sympy的diff函数求导

快乐星球

大佬们，我用sympy里的diff函数对一个十阶多项式求导，竟然耗时20秒

start = time.time()
x = symbols('x')
w = [1,205,2e+3,0.3,0.05,0.009,0.4,0.005,0.0001,1e-5,3.5e-6]

f = 0
length = len(w)
for i in range(length):
    f += w[i]*x**i
ds_1 = diff(f,x,1)
zhu =  solve(ds_1, x)
end = time.time()
print(ds_1)
print(zhu)
print('求导耗时%f秒'%(end - start))