如何检查列表中的元素是否为数字？

my_list = ['123', '456', '789']
for item in my_list:
    if not item.isnumeric():
        print(item + ' is not a number')

123 is not a number
456 is not a number
789 is not a number

my_list = ['123', '456', '789', 'hello', 'world']
for item in my_list:
    if not item.isnumeric():
        print(item + ' is not a number')

hello is not a number
world is not a number