Question

如何在python中将以下语句转换为日期（无需时间）？

 07-22 01:31:01.769: E/AndroidRuntime(27610): FATAL EXCEPTION: AsyncTask #1
07-22 01:31:01.769: E/AndroidRuntime(27610): Process: com.example.griding, PID: 27610
07-22 01:31:01.769: E/AndroidRuntime(27610): java.lang.RuntimeException: An error occured while executing doInBackground()
07-22 01:31:01.769: E/AndroidRuntime(27610):    at android.os.AsyncTask$3.done(AsyncTask.java:300)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at java.lang.Thread.run(Thread.java:841)
07-22 01:31:01.769: E/AndroidRuntime(27610): Caused by: java.lang.IllegalArgumentException: position=0 count=9223372036854775807
07-22 01:31:01.769: E/AndroidRuntime(27610):    at java.nio.FileChannelImpl.transferFrom(FileChannelImpl.java:368)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at com.example.myApp.DownloadManagerActivity$getUrlsClass.doInBackground(DownloadManagerActivity.java:284)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at com.example.myApp.DownloadManagerActivity$getUrlsClass.doInBackground(DownloadManagerActivity.java:1)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at android.os.AsyncTask$2.call(AsyncTask.java:288)
07-22 01:31:01.769: E/AndroidRuntime(27610):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
07-22 01:31:01.769: E/AndroidRuntime(27610):    ... 4 more

以下是我目前制作的代码：

10 days ago
about 2 months ago

它奏效了，但我觉得很尴尬。

Answer 1

使用正则表达式获取相关部分：

value, unit = re.search(r'(\d+) (\w+) ago', 'about 2 months ago').groups()

创建dateutil.relativedelta：

from dateutil.relativedelta import relativedelta
if not unit.endswith('s'): unit += 's'
delta = relativedelta(**{unit: int(value)})

从当前日期减去它：

from datetime import datetime
print datetime.now() - delta

所以整个功能将是：

from dateutil.relativedelta import relativedelta
from datetime import datetime

def ago_do_date(ago):
    value, unit = re.search(r'(\d+) (\w+) ago', ago).groups()
    if not unit.endswith('s'):
        unit += 's'
    delta = relativedelta(**{unit: int(value)})
    print datetime.now() - delta

python：如何转换＆＃34; x天前＆＃34;或者＆＃34; x个月前＆＃34;至今？

1 个答案: