              suffix = "cpu.txt"
          req_files = ["_requirements_base.txt", f"requirements_{suffix}"]
          pypath = os.path.dirname(os.path.realpath(__file__))
          requirements = []
          git_requirements = []
          for req_file in req_files:
              requirements_file = os.path.join(pypath, req_file)
              with open(requirements_file, encoding="utf8") as req:
                  for package in req.readlines():
                      package = package.strip()
 
</s> remove             requirements_file = os.path.join(pypath, req_file)
 </s> add             requirements_file = os.path.join(pypath, "requirements", req_file) </s> remove                     # parse_requirements can't handle git dependencies, so extract and then
                    # manually add to final list
                    if package and package.startswith("git+"):
                        git_requirements.append((package, []))
                        continue
 </s> add  </s> remove         with Popen(f"\"{sys.executable}\" -m pip freeze", shell=True, stdout=PIPE) as chk:
 </s> add         with Popen(f"\"{sys.executable}\" -m pip freeze --local", shell=True, stdout=PIPE) as chk: </s> remove             if (key == "git+https://github.com/deepfakes/nvidia-ml-py3.git" and
                    self.env.installed_packages.get("nvidia-ml-py3", "") == "7.352.1"):
                # Annoying explicit hack to get around our custom version of nvidia-ml=py3 being
                # constantly re-downloaded
                continue
 </s> add  </s> remove if sys.version_info[0] < 3:
    raise Exception("This program requires at least python3.7")
if sys.version_info[0] == 3 and sys.version_info[1] < 7:
 </s> add if sys.version_info < (3, 7):
              suffix = "cpu.txt"
          req_files = ["_requirements_base.txt", f"requirements_{suffix}"]
          pypath = os.path.dirname(os.path.realpath(__file__))
          requirements = []

          for req_file in req_files:
              requirements_file = os.path.join(pypath, req_file)
              with open(requirements_file, encoding="utf8") as req:
                  for package in req.readlines():
                      package = package.strip()
keep keep keep keep replace keep keep keep keep keep
 setup.py - python 3.9 support
    - move requirements files to dedicated folder
    - update all references to requirements files locations
    - setup.py: remove git requirements references
    - setup.py: allow running in python 3.9
    - windows/linux installers: default to python 3.9 environment
    - faceswap.py: cleaner python version check 
setup.py