用eval()来指标求和

今天，Python代码写的有点新意，晒一下

用eval

var('x,y,z')

f=x*y*z;

varlist=['x','y','z'];

ans=[eval('diff(f, ' + varlist[i] + ')') for i in range(3)];

def sumlist(l):

a=0;

for i in l:

a+=i;

return a;

ans=sumlist(ans);ans