I have the same error at 6th test
"Invalid value types (boolean): True should equal False".
I do not use any bool() functions, only return True or False.
What can it be?

I think I figured out whats the issue.
There is probably a True instead of a 1 in the grid. If you use something like isinstance(x, int) a bool will return True because bool is a subclass of int.

No more help needed, I found the origin.

I am testing Huffman encoding in Python: Passed tests : 2781 but Failed tests: 265

I don't undestand the following error
Log
frequencies(l)
l
encode([],l)
Test Passed
ERROR restore sorted sequence from frequencies should succeed: [] should equal ['l']

Can you help me Please

Unfortunatly I still don't find the error...

If you use isinstance:
isinstance returns you True if you compare "True" or "False" with int.
lst = [True]
isinstance(lst[0], int) == True

Hello,
I have the same error. All the other tests are valid. Did you find, what causes the error?

Is is possible to have the description of the 6th test "Should be invalid", I obtain the following error
Invalid value types (boolean): True should equal False

but I don't know why !!!