python学习笔记之匿名函数

def add(x,y):
    return x+y

add = lambda x,y:x+y
print(add(1,2))

dic={'k1':10,'k2':100,'k3':30}
def func(key):
    return dic[key]
print(max(dic,key=func))   #根据返回值判断最大值，返回值最大的那个参数是结果
print(max(dic,key=lambda key:dic[key]))
max([1,2,3,4,5,-6,-7],key=abs)

ret = map(abs,[-1,2,-3,4])
for i in ret:
    print(i)

def func(x):
    return x**2
ret = map(func,[-1,2,-3,4])
for i in ret:
     print(i)

ret = map(lambda x:x**2,[-1,2,-3,4])