将日期添加到嵌套列表中的列表项

Question

我输入了一个列表列表，（下面的示例）- 我想要得到的是以下内容

1) 如果当前月份是上半年，那么对于输入日期中的i，将current_year添加到i的末尾。并且对于 year_second_half 中的 i 将 yr + 1 添加到 i 中属于 year_second_half

的输入日期

示例-“8 月 5 日 19:45”变为“2018 年 8 月 5 日 19:45”，“1 月 2 日 15:00”变为“2019 年 1 月 2 日 15:00”

2) 如果当前月份在 year_second_half 中，则对于 input_dates 中的 i，将当前年份添加到 i 的末尾，其中月份在下半年。还有我所有的月份在上半年，将 yr - 1 添加到

示例（假设月份为 5 月）-“4 月 6 日 15:00”变为“2018 年 4 月 6 日 15:00”和“2017 年 8 月 5 日 19:45”

currentYear = datetime.now().year
this_yr = currentYear

currentMonth = datetime.now().month
this_month = currentMonth

year_first_half = ['August', 'September', 'October', 'November', 'December']
year_second_half = ['January', 'February', 'March', 'April', 'May']

input_dates =   [['5th August 19:45','8th December 12:30','16th December 16:00',
                '3rd January 20:00','12th January 15:00','19th January 15:00','30th January 20:00',
                '2nd February 15:00'],['9th December 15:00','23rd December 15:00',
                '27th December 20:00','2nd January 15:00','9th January 15:00',
                '6th April 15:00','27th April 15:00','4th May 15:00','12th May 15:00']]

newlist = []

for x in input_dates:
    for i in x:
        for month in year_first_half:
            if month in i and this_month in year_first_half:
                i = (i + ' {}').format(this_yr)
            elif month in i and this_month in year_second_half:
                i = (i + ' {}').format(this_yr - 1)    

        for month in year_second_half:
            if month in i and this_month not in year_second_half:
                i = (i + ' {}').format(this_yr + 1)

            elif month in i and this_month in year_second_half:
                i = (i + ' {}').format(this_yr) 



        newlist.append(i)
print(newlist)

当前输出 -

['5th August 19:45 2018', '8th December 12:30 2018', '16th December 16:00 2018', '3rd January 20:00 2019', '12th January 15:00 2019', '19th January 15:00 2019', '30th January 20:00 2019', '2nd February 15:00 2019', '9th December 15:00 2018', '23rd December 15:00 2018', '27th December 20:00 2018', '2nd January 15:00 2019', '9th January 15:00 2019', '6th April 15:00 2019', '27th April 15:00 2019', '4th May 15:00 2019', '12th May 15:00 2019']

这似乎行得通，但我想基本上以与我收到的完全相同的格式和顺序输出列表列表，除了添加年份，如上所示。

当我运行我的代码时，我只收到一个列表。有一个更好的方法吗？此任务的目的只是用正确的年份更新列表。

Answer 1

所以这里发生的是 input_dates 的第一个 for 循环运行两次次，因为列表中有 2 个列表（input_dates).因此，您需要创建另一个列表，该列表将附加在执行每个 for 循环时创建的列表。

我也修改了代码的逻辑。

修改后的代码如下：

from datetime import datetime
from dateutil.parser import parse
import numpy as np
import pandas as pd

currentYear = datetime.now().year
currentMonth = datetime.now().strftime("%B")

year_first_half = ['August', 'September', 'October', 'November', 'December']
year_second_half = ['January', 'February', 'March', 'April', 'May']

input_dates =   [['5th August 19:45','8th December 12:30','16th December 16:00',
                '3rd January 20:00','12th January 15:00','19th January 15:00','30th January 20:00',
                '2nd February 15:00'],['9th December 15:00','23rd December 15:00',
                '27th December 20:00','2nd January 15:00','9th January 15:00',
                '6th April 15:00','27th April 15:00','4th May 15:00','12th May 15:00']]

outer_list = []
for x in input_dates:
    inner_list = []
    for i in x:
        each_entry = parse(i)
        if currentMonth in year_first_half:
            if each_entry.strftime("%B") in year_first_half:
                i = (i + ' {}').format(currentYear)
            else:
                i = (i + ' {}').format(currentYear + 1)
        elif currentMonth in year_second_half:
            if each_entry.strftime("%B") in year_second_half:
                i = (i + ' {}').format(currentYear)
            else:
                i = (i + ' {}').format(currentYear - 1)
        inner_list.append(i)
    outer_list.append(inner_list)
print(outer_list)

将日期添加到嵌套列表中的列表项

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