使用itertools工具类中的chain方法,可以很方便的将多个iterable对象一起遍历. 不过,对于dict类型的iterable对象,只会遍历key.
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,
下面自定义一个my_chain,用于实现上面的功能
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,
