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一个类的定义

貌似是老版本的一个特性''

半睡半醒之间仿佛听见水手说

import numpy as np import matplotlib.pylab as plt def diff(f,x0,x1,select=1): # select = -1 is x0 derivation, select =1 is x1 derivation h=1e-4 x0=x0*select*-1 x1=x1*(select+1) y=f((x0+x1)+h)-f((x0+x1)-h) return y/(2*h) def fuction(x): return x**2 print(diff(fuction,3,4,-1))几句代码之实...