python search last occurence in string code example

Example 1: python search a string in another string get last result

# Where in the text is the last occurrence of the string "casa"?
txt = "Mi casa, su casa."

x = txt.rfind("casa")

print(x)

Example 2: how to find the last occurrence of a character in a string in python

original_string = "sentence one. sentence two. sentence three"

last_char_index = original_string.rfind(".")
new_string = original_string[:last_char_index] + "," + original_string
print(new_string)
"sentence one. sententce two, sentence three"