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Python: Get different time values with components of different timezones

Python Operating System Services: Exercise-21 with Solution

Write a Python program to get different time values with components timezone, timezone abbreviations, the offset of the local (non-DST) timezone, DST timezone and time of different timezones.

Sample Solution:

Python Code :

import time
import os
def zone_info():
   print('TZ   :', os.environ.get('TZ', '(not set)'))
   print('Timezone abbreviations:', time.tzname)
   print('Timezone : {} ({})'.format(
       time.timezone, (time.timezone / 3600)))
   print('DST timezone ', time.daylight)
   print('Time :', time.strftime('%X %x %Z'),'\n')
print('Default Zone:')
zone_info()
TIME_ZONES = [
   'Pacific/Auckland',
   'Europe/Berlin',
   'America/Detroit',
   'Singapore',
]
for zone in TIME_ZONES:
   os.environ['TZ'] = zone
   time.tzset()
   print(zone, ':')
   zone_info()

Sample Output:

Default Zone:
TZ   : (not set)
Timezone abbreviations: ('UTC', 'UTC')
Timezone : 0 (0.0)
DST timezone  0
Time : 12:05:33 01/20/20 UTC 

Pacific/Auckland :
TZ   : Pacific/Auckland
Timezone abbreviations: ('NZST', 'NZDT')
Timezone : -43200 (-12.0)
DST timezone  1
Time : 01:05:33 01/21/20 NZDT 

Europe/Berlin :
TZ   : Europe/Berlin
Timezone abbreviations: ('CET', 'CEST')
Timezone : -3600 (-1.0)
DST timezone  1
Time : 13:05:33 01/20/20 CET 

America/Detroit :
TZ   : America/Detroit
Timezone abbreviations: ('EST', 'EDT')
Timezone : 18000 (5.0)
DST timezone  1
Time : 07:05:33 01/20/20 EST 

Singapore :
TZ   : Singapore
Timezone abbreviations: ('+08', '+08')
Timezone : -28800 (-8.0)
DST timezone  0
Time : 20:05:33 01/20/20 +08

Python Code Editor:

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Python: Tips of the Day

Python: Cache results with decorators

There is a great way to cache functions with decorators in Python. Caching will help save time and precious resources when there is an expensive function at hand.

Implementation is easy, just import lru_cache from functools library and decorate your function using @lru_cache.

from functools import lru_cache

@lru_cache(maxsize=None)
def fibo(a):
    if a <= 1:
        return a
    else:
        return fibo(a-1) + fibo(a-2)

for i in range(20):
    print(fibo(i), end="|")

print("\n\n", fibo.cache_info())

Output:

0|1|1|2|3|5|8|13|21|34|55|89|144|233|377|610|987|1597|2584|4181|

 CacheInfo(hits=36, misses=20, maxsize=None, currsize=20)