from itertools import chain
my_list = [1, 2, 3]
my_dict = {
  'name': 'zs',
  'age': 45
}
# 使用chain将三个可迭代对象一起遍历, dict是打印key
for value in chain(my_list, my_dict, range(20, 30)):
  print(value, end=",") # 1,2,3,name,age,20,21,22,23,24,25,26,27,28,29,

def my_chain(*args, **kwargs):
  """注意: args是一个tuple, tuple是一个可迭代对象"""
  for iterable_obj in args:
    for value in iterable_obj:
      yield value
for value in my_chain(my_list, my_dict, range(20, 30)):
  print(value, end=",") # 1,2,3,name,age,20,21,22,23,24,25,26,27,28,29,