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I have written the code of my question, but there are still some bugs
You forgot to explain/describe what are the bugs. When you ask for help, it is a good idea to tell what is your problem.
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I can't figure out how to solve them.
Finding all bugs just by reading code is reserved to experts because of their experience and practice.
For beginners, there is a tool, the
debugger, and secondary effect, abusing it improve your learning curve.
Your code do not behave the way you expect, or you don't understand why !
There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.
Debugger - Wikipedia, the free encyclopedia[
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Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[
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Basic Debugging with Visual Studio 2010 - YouTube[
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27.3. pdb — The Python Debugger — Python 3.6.1 documentation[
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Debugging in Python | Python Conquers The Universe[
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pdb – Interactive Debugger - Python Module of the Week[
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The debugger is here to only show you what your code is doing and your task is to compare with what it should do.