Python 向嵌套列表中的列表项添加日期

我有一个列表列表作为输入，（下面的示例）-我想得到的是以下内容

1） 如果当前月份在上半年，则输入日期中的i将当前_年添加到i的末尾。对于年下半年的i，在年下半年的输入日期中向i添加yr+1

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

2） 如果当前月份在下半年，则对于输入日期中的i，将当前年份添加到i末尾，该月份在下半年。在我生命中的所有月份 在今年上半年，加上yr-1

例如（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)

电流输出-

['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']

这似乎是工作，但我想输出的清单基本上在完全相同的格式和顺序，我收到它除了添加年份，如上所示

---

当我运行代码时，我只收到一个列表。有更好的方法吗？这项任务的目的只是用正确的年份更新列表

因此这里发生的是

input\u dates

的第一个

循环运行两次，因为一个列表中有两个列表（input\u 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循环时创建的列表中

我还修改了代码的逻辑

这是修改后的代码：

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)

谢谢运行此命令，返回两个相同的列表。我希望返回的列表看起来像输入日期，但每个列表中每个列表项的末尾都有正确的年份。纳维看到我之前的评论了吗？有人对我需要什么有什么建议吗？@安菲尔德我修改了你的逻辑。纳维谢谢。这绝对是好的。唯一的问题是它用相同的元素打印列表两次