I appreciate your response a lot! Thanks!

• forbidding things is very hard in Python; the language is very dynamic and there are many, many ways to bypass naive restrictions
• this kata is old (more than 11 years old...) and overranked. there has been a rank deflation on Codewars over time, and unfortunately ranks cannot be changed
• in any case, this is not a proper kata issue

It's more like a 7 kyu.

Much too easy for 5 kyu!

Why should they be false?

State the language you used. Javascript contains a test with underscore.

Way to easy for Javascript, if regex is allowed its way to easy.

bruh that was a good one for a 5kyu, it tooks me half an hour to resolve it -_-

Not sure where you're referring to, but...

("hello world_", False)

OP left the building...

Too eazy for 5kyu

pls review the Rust version

First note:
Descriptions says: "No whitespaces / underscore". If we look at some solutions from Best Practices, we will see that them regular expressions will not pass the test if something similar is added to the tests: "PassW0r_d".

Second note:
On the use of the term 'Not very secure'. Thus, seems to be supposed to check at least one of the allowed characters, because 333333333333, which passes the test, cannot be called NOT secure enough.

If you look at all tests, the solution is very simple and does not quite correspond to the description and in my opinion does not match 5 kyu in my opinion.