Ok, but why? Isn't it an cata testing problem if it keep throw error when you solve a task with method that is different from what author expected you'l be using?

$a1 = [2,2,3];
$a2 = [4,9,9];
$this->revTest(comp($a1, $a2), false);
Why?? Must be true

if the array is larger than another array, there will be an error, and you do not have a check

A problem with your code is not a kata issue.

while u get this test ，do not use 'str.replace '

thanks brother.u are a nice guy

You can see the test data: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#how-can-i-see-which-input-causes-my-solution-to-fail

Print the input.

Nvm, wrong kata.

Use Python 3.8.

Cannot test in python 3.6 Error is "No module named 'codewars_test'"
Please fix

The tests are ok, read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution

Please delete the repeated post.