我如何使用timesince

Question

我找到了这个片段：

def timesince(dt, default="just now"):
        now = datetime.utcnow()
        diff = now - dt
        periods = (
                (diff.days / 365, "year", "years"),
        (diff.days / 30, "month", "months"),
        (diff.days / 7, "week", "weeks"),
        (diff.days, "day", "days"),
        (diff.seconds / 3600, "hour", "hours"),
        (diff.seconds / 60, "minute", "minutes"),
        (diff.seconds, "second", "seconds"),
    )
    for period, singular, plural in periods:
            if period:
                        return "%d %s ago" % (period, singular if period == 1 else plural)
    return default

并且想在 Google Appegine 中对我的数据库进行查询时在输出中使用它。 我的数据库看起来像这样：

class Service(db.Model):
    name = db.StringProperty(multiline=False)
    urla = db.StringProperty(multiline=False)
    urlb = db.StringProperty(multiline=False)
    urlc = db.StringProperty(multiline=False)
    timestampcreated = db.DateTimeProperty(auto_now_add=True)
    timestamplastupdate = db.DateTimeProperty(auto_now=True)

在 web 应用程序请求处理程序的主页中我想做：

            elif self.request.get('type') == 'list':
                    q = db.GqlQuery('SELECT * FROM Service')
                    count = q.count()
                    if count == 0:
                            self.response.out.write('Success: No services registered, your database is empty.')
                    else: 
                            results = q.fetch(1000)
                            for result in results:
                                    resultcreated = timesince(result.timestampcreated)
                                    resultupdated = timesince(result.timestamplastupdate)
                                    self.response.out.write(result.name + '\nCreated:' + resultcreated + '\nLast Updated:' + resultupdated + '\n\n')

我做错了什么？我在使用代码片段格式化代码时遇到问题。

我应该做哪一项？

这？

def timesince:
class Service
class Mainpage
  def get(self):

或者这个？

class Service
class Mainpage
  def timesince:
  def get(self):

我对 Python 不太熟悉，希望能提供有关如何解决此问题的任何意见。谢谢！

Answer 1

这对我来说效果很好：

from datetime import datetime 
def timesince(dt, default="now"):
    now = datetime.now()
    diff = now - dt
    periods = (
        (diff.days / 365, "year", "years"),
        (diff.days / 30, "month", "months"),
        (diff.days / 7, "week", "weeks"),
        (diff.days, "day", "days"),
        (diff.seconds / 3600, "hour", "hours"),
        (diff.seconds / 60, "minute", "minutes"),
        (diff.seconds, "second", "seconds"),
    )
    for period, singular, plural in periods:
        if period >= 1:
            return "%d %s ago" % (period, singular if period == 1 else plural)
    return default

timesince(datetime(2016,6,7,12,0,0))
timesince(datetime(2016,6,7,13,0,0))
timesince(datetime(2016,6,7,13,30,0))
timesince(datetime(2016,6,7,13,50,0))
timesince(datetime(2016,6,7,13,52,0))

Answer 2

我不太清楚您遇到的问题是什么，所以请耐心等待。回溯会很有帮助。 :)

timesince() 不需要任何成员变量，所以我认为它不应该位于其中一个类中。如果我处于您的情况，我可能会将 timessince 放入其自己的文件中，然后将该模块导入到定义 Mainpage 的文件中。

如果您将它们全部放在同一个文件中，请确保间距一致并且没有任何制表符。