ch02

2021-10-28 17:33:49 +05:30
parent ff85709895
commit 583ec6a898
17 changed files with 952 additions and 0 deletions
@@ -0,0 +1,143 @@
+
+# imports
+>>> from datetime import date, datetime, timedelta, timezone
+>>> import time
+>>> import calendar as cal
+>>> from zoneinfo import ZoneInfo
+
+
+# date
+>>> today = date.today()
+>>> today
+datetime.date(2021, 3, 28)
+>>> today.ctime()
+'Sun Mar 28 00:00:00 2021'
+>>> today.isoformat()
+'2021-03-28'
+>>> today.weekday()
+6
+>>> cal.day_name[today.weekday()]
+'Sunday'
+>>> today.day, today.month, today.year
+(28, 3, 2021)
+>>> today.timetuple()
+time.struct_time(
+    tm_year=2021, tm_mon=3, tm_mday=28,
+    tm_hour=0, tm_min=0, tm_sec=0,
+    tm_wday=6, tm_yday=87, tm_isdst=-1
+)
+
+# time
+>>> time.ctime()
+'Sun Mar 28 15:23:17 2021'
+>>> time.daylight
+1
+>>> time.gmtime()
+time.struct_time(
+    tm_year=2021, tm_mon=3, tm_mday=28,
+    tm_hour=14, tm_min=23, tm_sec=34,
+    tm_wday=6, tm_yday=87, tm_isdst=0
+)
+>>> time.gmtime(0)
+time.struct_time(
+    tm_year=1970, tm_mon=1, tm_mday=1,
+    tm_hour=0, tm_min=0, tm_sec=0,
+    tm_wday=3, tm_yday=1, tm_isdst=0
+)
+>>> time.localtime()
+time.struct_time(
+    tm_year=2021, tm_mon=3, tm_mday=28,
+    tm_hour=15, tm_min=23, tm_sec=50,
+    tm_wday=6, tm_yday=87, tm_isdst=1
+)
+>>> time.time()
+1616941458.149149
+
+
+# datetime, timezones and tiemdeltas
+>>> now = datetime.now()
+>>> utcnow = datetime.utcnow()
+>>> now
+datetime.datetime(2021, 3, 28, 15, 25, 16, 258274)
+>>> utcnow
+datetime.datetime(2021, 3, 28, 14, 25, 22, 918195)
+>>> now.date()
+datetime.date(2021, 3, 28)
+>>> now.day, now.month, now.year
+(28, 3, 2021)
+>>> now.date() == date.today()
+True
+>>> now.time()
+datetime.time(15, 25, 16, 258274)
+>>> now.hour, now.minute, now.second, now.microsecond
+(15, 25, 16, 258274)
+>>> now.ctime()
+'Sun Mar 28 15:25:16 2021'
+>>> now.isoformat()
+'2021-03-28T15:25:16.258274'
+>>> now.timetuple()
+time.struct_time(
+    tm_year=2021, tm_mon=3, tm_mday=28,
+    tm_hour=15, tm_min=25, tm_sec=16,
+    tm_wday=6, tm_yday=87, tm_isdst=-1
+)
+>>> now.tzinfo
+>>> utcnow.tzinfo
+>>> now.weekday()
+6
+>>> f_bday = datetime(
+    1975, 12, 29, 12, 50, tzinfo=ZoneInfo('Europe/Rome')
+)
+>>> h_bday = datetime(
+    1981, 10, 7, 15, 30, 50, tzinfo=timezone(timedelta(hours=2))
+)
+>>> diff = h_bday - f_bday
+>>> type(diff)
+<class 'datetime.timedelta'>
+>>> diff.days
+2109
+>>> diff.total_seconds()
+182223650.0
+>>> today + timedelta(days=49)
+datetime.date(2021, 5, 16)
+>>> now + timedelta(weeks=7)
+datetime.datetime(2021, 5, 16, 15, 25, 16, 258274)
+
+
+# parsing (stdlib)
+>>> datetime.fromisoformat('1977-11-24T19:30:13+01:00')
+datetime.datetime(
+    1977, 11, 24, 19, 30, 13,
+    tzinfo=datetime.timezone(datetime.timedelta(seconds=3600))
+)
+
+>>> datetime.fromtimestamp(time.time())
+datetime.datetime(2021, 3, 28, 15, 42, 2, 142696)
+
+>>> datetime.now()
+datetime.datetime(2021, 3, 28, 15, 42, 1, 120094)
+
+
+# arrow small demo
+>>> import arrow
+>>> arrow.utcnow()
+<Arrow [2021-03-28T14:43:20.017213+00:00]>
+>>> arrow.now()
+<Arrow [2021-03-28T15:43:39.370099+01:00]>
+
+>>> local = arrow.now('Europe/Rome')
+>>> local
+<Arrow [2021-03-28T16:59:14.093960+02:00]>
+>>> local.to('utc')
+<Arrow [2021-03-28T14:59:14.093960+00:00]>
+>>> local.to('Europe/Moscow')
+<Arrow [2021-03-28T17:59:14.093960+03:00]>
+>>> local.to('Asia/Tokyo')
+<Arrow [2021-03-28T23:59:14.093960+09:00]>
+>>> local.datetime
+datetime.datetime(
+    2021, 3, 28, 16, 59, 14, 93960,
+    tzinfo=tzfile('/usr/share/zoneinfo/Europe/Rome')
+)
+>>> local.isoformat()
+'2021-03-28T16:59:14.093960+02:00'