将日期时间附加到列表 - 列表保持为空答案

【问题标题】：append datetime to list - list remains empty将日期时间附加到列表 - 列表保持为空
【发布时间】：2022-09-23 04:00:17
【问题描述】：

我有一些代码读取包含日期的文件名列表，在拆分字符串以获取日期后，我想创建一个日期时间对象列表。但是，使用此代码，日期时间列表保持为空，而日期字符串列表已正确附加。

代码：

    calib_files = self.optitrack_calibration_listbox.get(0, END)
    format = \'%Y-%m-%d %H.%M.%S\'

    calib_datetimes = []
    calib_dates = []

    for calib in calib_files:
        calib_date = \' \'.join(calib.split(\' \')[1:3])
        calib_dates.append(calib_date)
        calib_datetimes.append(datetime.strptime(calib_date, format))

    print(f\'{calib_dates=}\')
    print(f\'{calib_datetimes=}\')

输出：

calib_files=(\'Cal 2021-10-11 11.35.52 (3DErr 4.949 mm) Poor.cal\', \'Cal 2021-10-11 11.44.49 (3DErr 0.285 mm).cal\', \'Cal 2021-10-28 09.01.21 (3DErr 0.656 mm) Excellent.cal\', \'Cal 2021-11-04 09.54.00 (3DErr 0.336 mm).cal\', \'Cal 2021-12-16 10.30.59 (3DErr 0.319 mm).cal\', \'Cal 2021-12-16 13.47.08 (3DErr 0.350 mm).cal\', \'Cal 2022-01-12 15.50.51 (3DErr 0.302 mm).cal\', \'Cal 
2022-01-17 16.43.21 (3DErr 0.239 mm).cal\', \'Cal 2022-01-19 09.41.54 (3DErr 0.300 mm).cal\', \'Cal 2022-01-24 14.52.10 (3DErr 0.352 mm).cal\', \'Cal 2022-02-10 09.42.10 (3DErr 0.447 mm).cal\', \'Cal 2022-02-17 10.12.50 (3DErr 0.507 mm).cal\', \'Cal 2022-02-21 10.19.46 (3DErr 0.390 mm).cal\', \'Cal 2022-03-04 10.12.26 (3DErr 0.347 mm).cal\', \'Cal 2022-03-07 14.40.24 (3DErr 0.431 
mm).cal\', \'Cal 2022-03-15 10.33.04 (3DErr 0.365 mm).cal\', \'Cal 2022-03-16 10.46.15 (3DErr 0.366 mm).cal\', \'Cal 2022-04-11 11.27.07 (3DErr 0.385 mm).cal\', \'Cal 2022-04-12 09.17.23 (3DErr 0.355 mm).cal\', \'Cal 2022-04-21 15.25.11 (3DErr 0.353 mm).cal\', \'Cal 2022-04-26 13.45.35 (3DErr 0.386 mm).cal\', \'Cal 2022-05-16 17.21.05 (3DErr 0.397 mm).cal\', \'Cal 2022-05-16 18.34.51 
(3DErr 0.395 mm).cal\', \'Cal 2022-05-23 14.05.07 (3DErr 0.375 mm).cal\', \'Cal 2022-06-23 15.27.01 (3DErr 0.456 mm).cal\', \'Cal 2022-07-05 14.15.08 (3DErr 1.125 mm) Excellent.cal\', \'Cal 2022-07-05 14.18.10 (3DErr 0.487 mm).cal\', \'Cal 2022-08-08 11.57.43 (3DErr 1.466 mm) Great.cal\', \'Cal 2022-08-08 12.00.56 (3DErr 0.483 mm).cal\', \'Cal 2022-08-23 14.11.53 (3DErr 0.457 mm).cal\')

calib_dates=[\'2021-10-11 11.35.52\', \'2021-10-11 11.44.49\', \'2021-10-28 09.01.21\', \'2021-11-04 09.54.00\', \'2021-12-16 10.30.59\', \'2021-12-16 13.47.08\', \'2022-01-12 15.50.51\', \'2022-01-17 16.43.21\', \'2022-01-19 09.41.54\', \'2022-01-24 14.52.10\', \'2022-02-10 09.42.10\', \'2022-02-17 10.12.50\', \'2022-02-21 10.19.46\', \'2022-03-04 10.12.26\', \'2022-03-07 14.40.24\', \'2022-03-15 
10.33.04\', \'2022-03-16 10.46.15\', \'2022-04-11 11.27.07\', \'2022-04-12 09.17.23\', \'2022-04-21 15.25.11\', \'2022-04-26 13.45.35\', \'2022-05-16 17.21.05\', \'2022-05-16 18.34.51\', \'2022-05-23 14.05.07\', \'2022-06-23 15.27.01\', \'2022-07-05 14.15.08\', \'2022-07-05 14.18.10\', \'2022-08-08 11.57.43\', \'2022-08-08 12.00.56\', \'2022-08-23 14.11.53\']

calib_datetimes=

calib_files 是文件名，calib_dates 是提取的日期字符串，calib_datetimes 应该是日期时间列表。

希望大家能帮忙！

谢谢！

这段代码的哪里打印了calid_files？
在函数调用之前的行中（该函数是我共享的代码）。

标签： python python-3.x list datetime append

【解决方案1】：

你得到什么错误？我可以毫无错误地运行您的代码并获得正确的结果...

from datetime import datetime
calib_files = ('Cal 2021-10-11 11.35.52 (3DErr 4.949 mm) Poor.cal',
               'Cal 2021-10-11 11.44.49 (3DErr 0.285 mm).cal',
               'Cal 2021-10-28 09.01.21 (3DErr 0.656 mm) Excellent.cal')
format = '%Y-%m-%d %H.%M.%S'

calib_datetimes = []
calib_dates = []

for calib in calib_files:
    calib_date = ' '.join(calib.split(' ')[1:3])
    calib_dates.append(calib_date)
    calib_datetimes.append(datetime.strptime(calib_date, format))

print(f'{calib_dates}')
print(f'{calib_datetimes}')

输出：

['2021-10-11 11.35.52', '2021-10-11 11.44.49', '2021-10-28 09.01.21']
[datetime.datetime(2021, 10, 11, 11, 35, 52), datetime.datetime(2021, 10, 11, 11, 44, 49), datetime.datetime(2021, 10, 28, 9, 1, 21)]

【讨论】：