Not adding and assigning?

[volcano63]

char_list8 has it's value set to whatever chars[number8][0] is, but it's value doesn't get updated if number8 happens to change. They're two unrelated things. If you want char_list8 to change, you have to also change char_list8. Programming would be incredibly difficult if all your variables changed their values whenever anything happened to unrelated other parts of your code.

Looks like OP believes thst he performs sort of reference binding from index to character set - which may be with a proper wrapper class, but not like that.

Looks like brute-force password breaker - which, in theory, should be implmented by a recursive function. Though in Python, with itertools.product, it is rather simple in a loop