cmd 命令下 pip install sympy

#求导

from sympy import *

y = Symbol('x')

diff(y**2,y)

#2*x

diff(f, *symbols, **kwargs)

   Differentiate f with respect to symbols.

   This is just a wrapper to unify .diff() and the Derivative class; its

   interface is similar to that of integrate().  You can use the same

   shortcuts for multiple variables as with Derivative.  For example,

   diff(f(x), x, x, x) and diff(f(x), x, 3) both return the third derivative

   of f(x).