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俺举一个微积分中，函数求导的例子。（不懂微积分或者对高数有心理阴影的同学，别担心，请把注意力集中在代码上） def d ( f ) : def calc ( x ) : dx = 0.000001 # 表示无穷小的Δx return ( f ( x + dx ) - f ( x )) / dx # 计算斜率。注意，此处引用了外层作用域的变量 f return calc # 此处用函数作为返回值（也就是函数 f 的导数） 现在，假设要计算二次函数 f(x) = x 2 + x + 1 的导数，只需如下代码： f = lambda x : x ** 2 + x + 1 # 先把二次函数用代码表达出来 f1 = d ( f ) # 这个f1 就是 f 的一阶导数啦。