Question

我有一个清单列表作为输入（下面的示例）-而我想得出的是以下内容

1）如果当前月份在上半年，则对于输入日期中的i，将current_year添加到i的末尾。同样，对于year_second_half中的i，在落入year_second_half中的输入日期中，将yr +1加到i中

示例-'8月5日19:45'变为'2018年8月5日19:45'和'1月2日15:00'变为'2019年1月2日1日'

2）如果当前月份在year_second_half中，那么对于i在input_dates中，将当前年份添加到i的末尾，其中月份在下半年。而且在我所有的几个月里属于上半年，将yr-1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']

这似乎可行，但我想以与接收时完全相同的格式和顺序输出列表清单，除了添加年份外，如上所示。

运行代码时，我只会收到一个列表。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，for的第一个input_dates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，该列表将追加在执行每个for循环时创建的列表。

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)

在嵌套列表中的列表项中添加日期

1 个答案: