From str to float in Python

Question

I really want to know how to change a nested str list such as [["2.1", "3.4"], ["1.1", "5.6"]] to a nested float list like [[2.1, 3.4], [1.1, 5.6]].

If it's not nested, I think it's realized by using map(float, "str_list"), but if I want to do that to a nested list, I haven't got any nice solution. Is there anybody who has some idea? I really appreciate your comment. Thank you in advance!!

Answer 1

Google is your friend:

[float(i) for i in str_list]

https://stackoverflow.com/questions/1614236/in-JUMP_LINK__&&__python__&&__JUMP_LINK-how-do-i-convert-all-of-the-items-in-a-list-to-floats?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa

Answer 2

Thank you for your suggestion, but if the str_list is nested like [["2.1", "3.4"], ["1.1", "5.6"]], Python returns TypeError which says argument must be a sting or a number, not 'list'. Is there any solution for that?