def put():
 print('this is put()')
 
def get():
 print('this is get()')
 
def post():
 return 0
 
method = put if post() else get
method() 

lambda [arguments] : expression用来创建匿名函数
 
method = lambda x : x**2
ret = method(2)
print(ret)

 
#if语句中f(1)==1时，前面的两个lambda表达式结果为1时，就返回，然后存于list中
f = [f for f in (lambda x: x, lambda x: x ** 2) if f(1) == 1]
print(f)#[<function <lambda> at 0x035B2930>, <function <lambda> at 0x035B2858>]
print(f[0](2))#返回：2
print(f[1](2))#返回：4

def action(x):
  return lambda y:x+y
f = action(2)
f(22) #24
#也可以直接：
action(2)(22)#返回：24