The study of Higher-order function in Python(20170913)

the variable can point to the function

print(abs) #
f = abs
print(f) #
print(f(-2)) # the variable point to the function abs()
# now f is amount to the abs(), this is a function f()

the function name is also a variable name

that means the functional name is just a variable name

which is point to the function

Afferent function（传入参数）

一个函数可以接收另一个函数作为参数，这种函数就称之为高阶函数

def fun1(x,y,fun):
return fun(x) + fun(y)
print(fun1(-9,-8,abs))

编写高阶函数，就是让函数的参数能够接收别的函数

把函数作为参数传入，这样的函数称为高阶函数，函数式编程就是指这种高度抽象的编程范式。