Why is there a "'str' object attribute 'replace' is read-only'" error?

Question

Python

Maybe I'm just stupid, I apologize in advance)
code:

number=input('Введите номер телефона:')
if len(number)==11 and number.isdigit():
  number.replace=str(number.replace)
  number.replace=number.replace(number[0:7],'*')
  print(number.replace)

mistake:

Введите номер телефона:89143434299
Traceback (most recent call last):
  File "d:\python\test.py", line 3, in <module>
    number.replace=str(number.replace)
AttributeError: 'str' object attribute 'replace' is read-only

Answer 1

number=input('Введите номер телефона:')
if len(number)==11 and number.isdigit():
    number=number.replace(number[0:7],'*')
print(number)

Answer 2

I can’t even imagine what forced you to try to assign its string representation to a method.