def bar():

    print("in the bar")

def  test1(func):

    print("in the test1")

    print(func)

    func()   #func=bar    func()=bar()

test1(bar)

打印结果

---------------------------------

in the test1
<function bar at 0x000001DA445500D0>
in the bar

#实现bar的运行时间的高阶函数
import time

def bar():

    time.sleep(3)

    print("in the bar")

def  test1(func):

    star_time=time.time()

    func()  #bar()

    stop_time=time.time()

    print("the func run time is %s"%(stop_time-star_time))

test1(bar)

打印结果

-----------------------------------

in the bar

the func run time is 3.0002150535583496

import time

def bar():

    time.sleep(3)

    print("int the bar")

def test2(func):

    print(func)

    return func

print(test2(bar))

t=test2(bar)

bar=test2(bar)

t()  #t()=bar()

print(t)

bar=test2(bar)  #覆盖原来的bar

bar()       #不修改原来的调用方式

打印结果

——————————————————————————

<function bar at 0x00000224596500D0>

<function bar at 0x00000224596500D0>

<function bar at 0x00000224596500D0>

<function bar at 0x00000224596500D0>

int the bar

<function bar at 0x00000224596500D0>

<function bar at 0x00000224596500D0>

int the bar