How do I use timesince

I found this snippet:

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

and want to use it in an output when doing a query to my database in Google Appegine. My database looks like so:

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)

In the mainpage of the webapp requesthandler I want to do:

            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')

What am I doing wrong? I'm having troubles with formatting my code using the snippet.

Which one of these should I do?

this?

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

or this?

class Service
class Mainpage
  def timesince:
  def get(self开发者_如何学Python):

I'm not too familiar with Python and would appreciate any input on how to fix this. Thanks!

I'm not totally clear what the problem you're having is, so bear with me. A Traceback would be helpful. :)

timesince() doesn't require any member variables, so I don't think it should be inside one of the classes. If I were in your situation, I would probably put timesince in its own file and then import that module in the file where Mainpage is defined.

If you're putting them all in the same file, make sure that your spacing is consistent and you don't have any tabs.

This works fine for me:

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))