Python3.8：组合两个日期时间变量

Question

I have the following code

import datetime
Date_0 = [datetime.date(2021,3,10), datetime.date(2021,3,11)]
Date_1 = datetime.date(2021,3,12)
Date_combine = [Date_0, Date_1]

I got the result of Data_combine: [[2021-03-10, 2021-03-11], 2021-03-12] But I want to get this: [2021-03-10, 2021-03-11, 2021-03-12]

How could I achieve this? Thank you!

Answer 1

Just make a new list that unpacks the existing list and adds on the new element:

Date_combine = [*Date_0, Date_1]

The * says "unpack the contents of Date_0 here without the wrapping" (see PEP 448 for details). Put * s before any element that is itself a list or other iterable and you want to include the contents of, leave it off for the values you want to include as themselves, without unpacking.

On older Python (pre-3.5), you could use concatenation for a simple case like this, by wrapping the non- list elements in temporary list s eg:

Date_combine = Date_0 + [Date_1]

or if you don't need it to be a new list , and modifying Date_0 in place is fine, the even simpler:

Date_0.append(Date_1)