There is a syntax error, why?

Question

Python

In line

cursor.execute(f"SELECT id_user FROM users WHERE id_user = {people_id}")

SyntaxError: invalid syntax occurs

Answer 1

f-strings have appeared in Python since version 3.6
But in any case, you should not use f-strings to form SQL queries

cursor.execute("SELECT id_user FROM users WHERE id_user = ?", (people_id,))

Answer 2

You can't push an element into a string

Answer 3

The second python, or what?
f-strings only in the third