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Python relative time
from datetime import datetime, timedelta
from dateutil import relativedelta
from datetime import datetime
from dateutil.tz import tzutc, tzlocal
def humanize_time(time):
'''
get a datetime object and return a relative time string like
"one hour ago", "yesterday", "3 months ago", "just now", etc.
'''
rd = relativedelta.relativedelta(datetime.now(tzutc()), time)
def line(number, unit):
if abs(number) < 10 and unit == "seconds":
return "just now"
if number == 1 and unit == "days":
return 'yesterday'
if number == -1 and unit == "days":
return "tomorrow"
prefix, suffix = '', ''
unit = unit if abs(number) > 1 else unit[:-1] # Unpluralizing.
if number > 0:
suffix = " ago"
else:
prefix = "in "
return "%s%d %s%s" % (prefix, abs(number), unit, suffix)
for attr in ['years', 'months', 'days', 'hours', 'minutes', 'seconds']:
value = getattr(rd, attr)
if value != 0:
return line(value, attr)
return "just now"
class UtilsTest(unittest.TestCase):
def test_humanize_time(self):
now = time = datetime.now(tzlocal())
self.assertEqual('just now', humanize_time(time))
time = now - timedelta(seconds=45)
self.assertEqual('45 seconds ago', humanize_time(time))
time = now - timedelta(seconds=60)
self.assertEqual('1 minute ago', humanize_time(time))
time = now - timedelta(seconds=15*60)
self.assertEqual('15 minutes ago', humanize_time(time))
time = now - timedelta(hours=1)
self.assertEqual('1 hour ago', humanize_time(time))
time = now - timedelta(hours=10)
self.assertEqual('10 hours ago', humanize_time(time))
time = now - timedelta(days=1)
self.assertEqual('yesterday', humanize_time(time))
time = now - timedelta(days=2)
self.assertEqual('2 days ago', humanize_time(time))
time = now - timedelta(days=31)
self.assertEqual('1 month ago', humanize_time(time))
time = now - timedelta(days=31*2)
self.assertEqual('2 months ago', humanize_time(time))
time = now - timedelta(days=366)
self.assertEqual('1 year ago', humanize_time(time))
time = now - timedelta(days=366*2)
self.assertEqual('2 years ago', humanize_time(time))
if __name__ == '__main__':
unittest.main()
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