''' Purpose(s):
        String chrestomathics
        Motivate the need for looping
'''

ADAGE = "Love is all you need"

# prompt and get from user the number of occurrences to be printed

reply = input( "Enter number of lines to be printed: " )

n = int( reply )
# since we want an integer, reply is a string, so we cast it to an int

# print the n occurrences of the string of interest
# sometimes there are too many print statements for us to do manually --> need loop

# DO NOT USE for, in AS VARIABLE NAMES !!!!!!!!
# keywords are reserved !!!! DON'T USE THEM AS VARIABLES
# if you reassign them, it will remove all the function from it

# for --> python recognizes that you want to start a for loop
# expects a loop variable
#   you do NOT need to define this before the loop
#   even if you did, the for loop will assign it the values inside the sequence of values
#   can be named anything
# in --> expects a sequence of values; separate the loop variable from the sequence
# expects sequence of values like range(x, y)
# :

# counting loop - repeat something a certain number of time
# range(x, y)
#   x = start
#   y = up to but not including y - stop point
#       includes y - 1 !!!!!!
for loop_variable in range(0, n):   # loop_variable automatically takes on the values 0, 1, 2, 3, ... n - 1 one at a time
    # indent the body of the loop - tells python these codes belong within the loop
    # body = action of the loop

    # here we say we start at 0
    # and we go all the way up to n - 1 !!!!!
    # between 0 and n-1, there are n numbers !!!!!!!

    print( loop_variable, ': ', ADAGE )  # this print() is part of the loop, so we do this n times

    # each time through the loop, we print the above things n times!
    # loop_variable goes through each number within the range we defined in the range() function
    # 1st time: loop_variable = 0
    # 2nd time: loop_variable = 1
    # ...
    # n_th time: loop_variable = n - 1

    # yes, loop_variable automatically updates every time the for loop restarts
    # loop_variable could be named anything that makes sense in context
    # you don't need to define the loop_variable before the for loop !!!!!!!!!
    # generally don't use loop_variable outside the loop, otherwise, you might override something
    #   helps you with understanding your code better and help you better organize your code

    print() # this is part of the loop, along with the above print statement;
    # this will print an empty line underneath each line of the above print statement

    # so this code will print loop_variable: ADAGE then print an empty line underneath it

    # there are technically no max # of actions under loops but generally don't want it too big

print()  # not indented, so not part of loop --> we only do this once

total = 0    # accumulator - we want to accumulate the values between the values of 0 and n

for i in range(0, n):
    print( ADAGE )
    total = total + i                  # each time through the loop, we use i and adding to total --> we keep updating total each
                                       # time through the loop
    # before loop runs, total = 0
    # 1st time: total = total + 0 --> 0 + 0 => total = 0
    # 2nd time: total = total + 1 --> 0 + 1 => total = 1
    # 3rd time: total = total + 2 --> 1 + 2 => total = 3
    # nth time: total = total + (n-1) --> __ + ( n - 1 ) = total = whatever the sum is

    # don't need to use the loop variable inside the loop, but you NEED one when you start a for loop

    # printing total inside the for loop will give you the progress of the updates

print( 'total =', total )
# when we print the value in total after the for loop, we only print the very last thing that was updated to total




print()

# if n = 3, the final value of i = 2 (n - 1), so after the above for loop (line 67), i = 2 here
print( i )

print()

# THIS IS NOT THE SAME AS RANGE !!!!!
# i will just be the values inside ()
#   i = 0
#   i = n
# NOT A RANGE !! MUST USE range(0, n)
# this loop will only run 2 times, because there are only 2 values inside ()
for i in (0, n):
    print( i, ': ', ADAGE )

# range(0, n) == range( 0, n ) == range(0,n) --> whitespaces don't matter * this is a style rule, not a syntax rule

# read for loops mindfully! recognize what you have written, not what you meant when debugging
# use print statements to help you while debugging: check out your variables, check for loops, ...

print()

# i still exists after for i loop -- IT CONTAINS THE VERY LAST VALUE THAT WAS ASSIGNED TO IT
# here the last value of i is from the for loop at line 84 = n --> if n = 3, then i = 3
print( i )