python string first and last char identification problem

Question

if first and last char of a string in python are the same while using replace method and uppercase on only the first char the change happens on both first and last char , why??

>>> text = 'standards'
>>> text = text.replace(text[0],(text[0].upper()))
>>> text
'StandardS'

Answer 1

.replace() function will replace all characters in string, if you just want to change first char,you can trying divide string and conquer after, like this:

text=f'{text[0].upper()}{text[1:]}'