Python reemplaza la última aparición en el ejemplo de código de cadena

Ejemplo 1: cómo reemplazar el último carácter de una cadena en python

sample_string = "712345677890 173445667"
# if i wanted to do:
new_string=sample_string.replace("7", r)
print new_string
#you won't get your results
#Output:
r123456rr890 1r344566r
#but i wanted it to be
712345677890 17344566r
#there are different methods of solving this problem but i use this one
new_string=sample_string [:-1] + "r" # you can make change the amount of last letters getting replaced like for example the last three letters you would change [:-1] to [:-3]
#Output:
712345677890 17344566r #yay this is it

Ejemplo 2: Python reemplaza la primera aparición en una cadena

# string replace() function perfectly solves this problem:

# string.replace(s, old, new[, maxreplace])

# Return a copy of string s with all occurrences of substring old replaced 
# by new. If the optional argument maxreplace is given, the first maxreplace 
# occurrences are replaced.

>>> u'longlongTESTstringTEST'.replace('TEST', '?', 1)
u'longlong?stringTEST'

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