''' Purpose: introduce how string accumulation works by building the reverse
             of a user-supplied string
'''

# get text from user
text = input( 'Enter text: ' )

print()

# EXAMPLE OF STRING ACCUMULATION
# RECAP:
# STRING ACCUMULATION FORMAT
    # string_accumulator = ''
    # for ... in ...:
        # string_accumulator = string_accumulator + string we wanna add (or character) - uses concatenation

# This builds up the string_accumulator!
# initialize the reversal accumulator
reverse = '' # string accumulator must be initialized to '' (empty string) - we don't know what we're
# building up yet so we need to initialize the string to empty so that we can add characters / strings to it and
# build up (accumulate) the final string output using the for loop

for current_character in text :
    # add current character to the reversal
    print( 'Loop variable:', current_character )
    # reverse = reverse + current_character # makes a copy of the string
    reverse = current_character + reverse # Add current_character to the front of the current version of reverse
    print( 'Reverse so far:', reverse ) # print out the string accumulator so far as we build it up

padded = '' # another string accumulator
for current_character in text :
    padded = padded + ' ' + current_character  # the modification being added each time is ' ' + current_character
    print('Padded so far:', padded)


# print the result
print( "'" + reverse + "'") # final build up string

padded = padded.strip()
print( "'" + padded + "'") # final build up string