''' Purpose: consider string replace() functions
'''

text = input( "Enter text: " )

s = input( "Enter substring (s): " )

r = input( "Enter substring (r): " )

print()

# get version of text with occurrences of s replaced with r
# NEW FUNCTION: replace() -> text.replace(substring, what we wanna replace it with) -> returns
# copy of string with each instance of s replaced with r below
# s = 'hello'
# new_string = s.replace('ll', 'yy')
# new_string is 'heyyo'
modified_text = text.replace( s, r )

print( "text.replace( s, r ):", modified_text, "   # text's s's replaced with r's" )

# Hitting the enter key for r is the same as providing an empty string ''
# s = 'yellow bellied sap sucker'
# modified_text = text.replace('e','') -> puts an empty string there (basically gets rid of those characters)
# e's become ''
# yllow bllid sap suckr

# '' is not ' '
# empty string vs. space
# Length 0         Length 1