Fixing "PermissionError: [Errno 13] Permission denied"

[puredata]

Hello, I'm trying to use Python to automate unzipping of multiple files in a folder. I already have a script that works and unzips my files. But it won't copy contents of the zip files which has subfolders. In order to be able to extract everything into one main folder (disregarding original subfolder structure) I have found this code chunk on stackexchange. A moderator reported that the code is working for him therefore I should be investigating something else, not the code itself.

import os
import shutil
import zipfile

my_dir = r"C:\Users\username\My_Dataset\new"
my_zip = r"C:\Users\username\My_Dataset"

with zipfile.ZipFile(my_zip) as zip_file:
    for member in zip_file.namelist():
        filename = os.path.basename(member)
        # skip directories
        if not filename:
            continue

        # copy file (taken from zipfile's extract)
source = zip_file.open(member)
target = open(os.path.join(my_dir, filename), "wb")
with source, target:
     shutil.copyfileobj(source, target)

Here is the Traceback I get:

Error:
Traceback (most recent call last):
  File "C:/Users/username/PycharmProjects/GeoPandas/mergeAnswer.py", line 8, in <module>
    with zipfile.ZipFile(my_zip) as zip_file:
  File "C:\Users\username\Anaconda3\envs\playground\lib\zipfile.py", line 1207, in __init__
    self.fp = io.open(file, filemode)
PermissionError: [Errno 13] Permission denied: 'C:\\Users\\username\\My_Dataset

The only thing that looks suspicious to me is the direction of the slashes on Traceback. Some of them are forwards slashes while some of them are backwards. Could it be related to that? I'm running this code in Windows and haven't tried on a mac or linux.

Would it be possible to get some suggestions in order to make this script work? I don't need to use this specific script, I'm just trying to unzip a lot of files (some are under subfolders some are not) into one main folder.

Thanks in advance!