1、函数即变量2、高阶函数
a、把一个函数名当做实参创给另一个函数；
import time
def bar():
print('in the bar')
def test(func):
start_tmie=time.time()
func()
stop_time=time.time()
print('the func run time is %s'%(stop_time-start_tmie))
test(bar)
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import time
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def bar():
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print('in the bar')
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def test(func):
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start_tmie=time.time()
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func()
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stop_time=time.time()
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print('the func run time is %s'%(stop_time-start_tmie))
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test(bar)
b、返回值包含函数名，不用修改函数的调用方式
import time
def bar():
time.sleep(3)
print("in the bar")
def test2(func):
print(func)
return func
bar=test2(bar)
bar()
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import time
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def bar():
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time.sleep(3)
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print("in the bar")
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def test2(func):
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print(func)
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return func
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bar=test2(bar)
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bar()
函数嵌套
def test01():
print('in the test01')
def test02():
print('in the test02')
test02()
test01()
######打印结果#####
in the test01
in the test02
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def test01():
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print('in the test01')
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def test02():
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print('in the test02')
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test02()
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test01()
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######打印结果#####
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in the test01
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in the test02
全局作用域和局部作用域
3、装饰函数
高阶函数+嵌套函数=装饰函数
# Aduthor:CCIP-Ma
import time
def timer(func):
def deco():
start_time=time.time()
func()
stop_time=time.time()
print('the time %s'%(stop_time-start_time))
return deco #返回门牌号，内存地址
@timer #test1=timer(test1) 意思一样
def test1():
time.sleep(3)
print('in the test1')
test1()
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# Aduthor:CCIP-Ma
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import time
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def timer(func):
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def deco():
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start_time=time.time()
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func()
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stop_time=time.time()
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print('the time %s'%(stop_time-start_time))
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return deco #返回门牌号，内存地址
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#test1=timer(test1) 意思一样
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def test1():
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time.sleep(3)
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print('in the test1')
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test1()