code: def patch_wheel(in_wheel, patch_fname, out_wheel=None):
      
      in_wheel = abspath(in_wheel)
      patch_fname = abspath(patch_fname)
      if out_wheel is None:
          out_wheel = in_wheel
      else:
          out_wheel = abspath(out_wheel)
      if not exists(patch_fname):
          raise ValueError("patch file {0} does not exist".format(patch_fname))
      with InWheel(in_wheel, out_wheel):
          with open(patch_fname, 'rb') as fobj:
              patch_proc = Popen(['patch', '-p1'],
                                 stdin = fobj,
                                 stdout = PIPE,
                                 stderr = PIPE)
              stdout, stderr = patch_proc.communicate()
              if patch_proc.returncode != 0:
                  raise RuntimeError("Patch failed with stdout:\n" +
                                     stdout.decode('latin1'))
docs: Apply ``-p1`` style patch in `patch_fname` to contents of `in_wheel`
  
      If `out_wheel` is None (the default), overwrite the wheel `in_wheel`
      in-place.
  
      Parameters
      ----------
      in_wheel : str
          Filename of wheel to process
      patch_fname : str
          Filename of patch file.  Will be applied with ``patch -p1 <
          patch_fname``
      out_wheel : None or str
          Filename of patched wheel to write.  If None, overwrite `in_wheel`