详解 Python中LEGB和闭包及装饰器

passline = 60def func(val):  if val >= passline:    print ('pass')  else:    print ('failed')  def in_func():    print (val)  in_func()  return in_funcf = func(89)f()print (f.__closure__)

def f_100(val):  passline = 60  if val >= passline:    print ('pass')  else:    print ('failed')def f_150(val):  passline = 90  if val >= passline:    print ('pass')  else:    print ('failed')f_100(89)f_150(89)

def set_passline(passline):  def cmp(val):    if val >= passline:      print ('Pass')    else:      print ('failed')  return cmpf_100 = set_passline(60)f_150 = set_passline(90)f_100(89)f_150(89)

def my_sum(*arg):  if len(arg) == 0:    return 0  for val in arg:    if not isinstance(val,int): # 有一个非int则返回0      return 0  return sum(arg)def my_average(*arg):  if len(arg) == 0:    return 0  for val in arg:    if not isinstance(val,int): # 有一个非int则返回0      return 0  return sum(arg)/len(arg)print (my_sum(1,2,3,4,5))print (my_sum(1,2,3,4,5,'6'))print (my_aveage(1,2,3,4,5))print(my_average())

def my_sum(*arg):  return sum(arg)def my_average(*arg):  return sum(arg)/len(arg)def dec(func):  def in_dec(*arg): # my_sum    print ('in dec arg= ',arg)    if len(arg) ==0:      return 0    for val in arg:      if not isinstance(val, int):        return 0    return func(*arg)  # 闭包，存在于in_dec函数中的__closure__中，所以可以调用  return in_decmy_sum = dec(my_sum)  # 传参print(my_sum (1,2,3,4,5)）print(my_sum (1,2,3,4,5,'6')）# my_sum就是in_dec函数，会先执行参数类型判断，然后执行__closure__中的函数my_sum

def dec(func):  def in_dec(*arg): # my_sum    print ('in dec arg= ',arg)    if len(arg) ==0:      return 0    for val in arg:      if not isinstance(val, int):        return 0    return func(*arg)  # 闭包，存在于in_dec函数中的__closure__中，所以可以调用  return in_dec  # 如果没有返回值，则my_sum调用装饰器后为None# my_sum = dec(my_sum)  # 不手动传参@dec     # 装饰器将my_sum作为参数传入dec，并返回一个新的函数赋值给my_sumdef my_sum(*arg):  return sum(arg)def my_average(*arg):  return sum(arg)/len(arg)print(my_sum (1,2,3,4,5))print(my_sum (1,2,3,4,5,'6'))

def deco(func):  def in_deco(x,y):    print ('in deco')    func(x,y)  print ('call deco')  return in_deco@decodef bar(x, y):  print ('in bar',x+y)bar(1,2)