Clock Functions.py

'''Python Clock Functions:'''
'''
Created by Joseph C. Richardson, GitHub.com

Python clock functions allow you to program the actual time in real time.
Python clock functions work internally, in sync with the Windows clock.
With Python clock functions; you can set the hour, minute, second, month,
week, day and date. See Python clock function prefix descriptions below.

# HIGHLIGHT AND COPY CODE, THEN PASTE INTO YOUR PREFERABLE PYTHON APP/IDLE

'%I' 12-hour prefix
'%H' 24-hour prefix
'%M' Minutes prefix
'%S' Seconds prefix
'%p' AM/PM prefix
'%A' Day of week prefix
'%B' Month prefix
'%d' Date prefix
'%Y' Year prefix
'%U' Weeks per year prefix
'%j' Days per year prefix
'''
# Let's create a simple Python clock by invoking the Python clock function
# prefixes. First, however, we also need to import two modules; 'time' and
# 'datetime'. Type and execute/run the program example below and see
# what happens.

import time
import datetime

print(datetime.datetime.now().strftime('%I:%M:%S:%p'))
print(datetime.datetime.now().strftime('%H:%M:%S'))
print(datetime.datetime.now().strftime('%A %B %d,%Y'))
print(datetime.datetime.now().strftime('Week %U'))
print(datetime.datetime.now().strftime('Day %j'))

# Remember you can reduce balky code via, using string variables. Let's
# use 'timer' as the variable and use 'datetime.datetime.now()' as the value.
# Type and execute/run the program example below and see what happens.

import time
import datetime

timer=datetime.datetime.now()

print(timer.strftime('%I:%M:%S:%p'))
print(timer.strftime('%H:%M:%S'))
print(timer.strftime('%A %B %d,%Y'))
print(timer.strftime('Week %U'))
print(timer.strftime('Day %j'))

# Now, let's create a tuple variable called 'show_time' so we can reduce
# even more balky code, and also gain greater manipulative programming
# skills at the same time. Type and execute/run the program example
# below and see what happens.

import time
import datetime

show_time=(
    '%I:%M:%S:%p',
    '%H:%M:%S',
    '%A %B %d,%Y',
    'Week %U',
    'Day %j'
    )

timer=datetime.datetime.now()

print(timer.strftime(show_time[0]))    
print(timer.strftime(show_time[1]))    
print(timer.strftime(show_time[2]))    
print(timer.strftime(show_time[3]))
print(timer.strftime(show_time[4]))
 
# Now change and rearrange the tuple number values [0] through [4] in
# the program example above and re-execute/run the program and see
# what happens.

# Now, let's make our Python clock come to life. Let's also keep the code
# less balky and much more program manipulative at the same time. To
# make the Python clock come to life, we are simply going to use a while-
# loop to constantly refresh the screen output. A 'time.sleep()' function
# will also be implemented to create a one-second sleep delay in the screen
# output. Let's also implement the 'os.system()' function to clear the screen
# output right after every one-second 'time.sleep' delay. Type and execute/
# run the program example below and see what happens.

import os
import time
import datetime

show_time=(
    '%I:%M:%S:%p',
    '%H:%M:%S',
    '%A %B %d,%Y',
    'Week %U',
    'Day %j'
    )

while True:
    timer=datetime.datetime.now()
    print(timer.strftime(show_time[0]))
    print(timer.strftime(show_time[1]))
    print(timer.strftime(show_time[2]))
    print(timer.strftime(show_time[3]))
    print(timer.strftime(show_time[4]))
    
    time.sleep(1)
    os.system('cls')

# Let's shorten our code by reducing our print() functions down to only one,
# using a for loop inside the while loop.

while True:
    for i in range(5):
        timer=datetime.datetime.now()
        print(timer.strftime(show_time[i]))      

    time.sleep(1)
    os.system('cls')