Why doesn't MySQL pass updated values ​​that were updated by another user?

Question

MySQL

Question: there is MySQL which costs on a remote server. I'm working with two Python files, each logged into MySQL with different users.
Why, when both scripts are running, and on script B, I updated the table, after which by making a request on script A, it returns the data to me before the change. That is, script A did not see the changes in script B. What is this?

Answer 1

read "transaction isolation levels"