lambda x:x*x

整理自：廖雪峰的讨论区

https://www.liaoxuefeng.com/discuss/001409195742008d822b26cf3de46aea14f2b7378a1ba91000/0014582466554406b47c51ff8a44fc881529a75788f267d000

lambda 基础学习: https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/001431843456408652233b88b424613aa8ec2fe032fd85a000

1. lambda x:x*x等同于

def f(x):

    return x*x

2. 
   

def build():

    return lambda x:x*x

等同于：

def build():

    def f(x):

        return x*x

    return f

引用

print(build()(5))    #等同于   f=build()    print(f(5))

3. 
   

def build(x):

    return lambda :x*x

等同于

def build(x):

    def f():

        return x*x

    return f

引用

print(build(5)())  

4. 
   

def build(x):

    return lambda x:x*x

等同于

def build(x):

    def f(x):

        return x*x

    return f

引用

print(build(5)(4))     #16

print(build('a')(4))    #16