For a given directory, unzip all .gz files in folder, save unzipped files in folder and deleted zipped files. A python solution for instances where you do not have access to PowerShell.

gz_extract.py

import os, gzip, shutil

dir_name = 'x'

def gz_extract(directory):
    extension = ".gz"
    os.chdir(directory)
    for item in os.listdir(directory): # loop through items in dir
      if item.endswith(extension): # check for ".gz" extension
          gz_name = os.path.abspath(item) # get full path of files
          file_name = (os.path.basename(gz_name)).rsplit('.',1)[0] #get file name for file within
          with gzip.open(gz_name,"rb") as f_in, open(file_name,"wb") as f_out:
              shutil.copyfileobj(f_in, f_out)
          os.remove(gz_name) # delete zipped file
        
gz_extract(dir_name)