code: def move(src, dst, copy_function=copy2):
      """Recursively move a file or directory to another location. This is
      similar to the Unix "mv" command. Return the file or directory's
      destination.
  
      If the destination is a directory or a symlink to a directory, the source
      is moved inside the directory. The destination path must not already
      exist.
  
      If the destination already exists but is not a directory, it may be
      overwritten depending on os.rename() semantics.
  
      If the destination is on our current filesystem, then rename() is used.
      Otherwise, src is copied to the destination and then removed. Symlinks are
      recreated under the new name if os.rename() fails because of cross
      filesystem renames.
  
      The optional `copy_function` argument is a callable that will be used
      to copy the source or it will be delegated to `copytree`.
      By default, copy2() is used, but any function that supports the same
      signature (like copy()) can be used.
  
      A lot more could be done here...  A look at a mv.c shows a lot of
      the issues this implementation glosses over.
  
      """
      sys.audit("shutil.move", src, dst)
      real_dst = dst
      if os.path.isdir(dst):
          if _samefile(src, dst):
              # We might be on a case insensitive filesystem,
              # perform the rename anyway.
              os.rename(src, dst)
              return
  
          # Using _basename instead of os.path.basename is important, as we must
          # ignore any trailing slash to avoid the basename returning ''
          real_dst = os.path.join(dst, _basename(src))
  
          if os.path.exists(real_dst):
              raise Error(
                  "Destination path '%s' already exists" % real_dst
              )
      try:
          os.rename(src, real_dst)
      except OSError:
          if os.path.islink(src):
              linkto = os.readlink(src)
              os.symlink(linkto, real_dst)
              os.unlink(src)
          elif os.path.isdir(src):
              if _destinsrc(src, dst):
                  raise Error(
                      "Cannot move a directory '%s' into itself"
                      " '%s'." % (src, dst)
                  )
              if _is_immutable(src) or (
                  not os.access(src, os.W_OK)
                  and os.listdir(src)
                  and sys.platform == "darwin"
              ):
                  raise PermissionError(
                      "Cannot move the non-empty directory "
                      "'%s': Lacking write permission to '%s'."
                      % (src, src)
                  )
              copytree(
                  src,
                  real_dst,
                  copy_function=copy_function,
                  symlinks=True,
              )
              rmtree(src)
          else:
              copy_function(src, real_dst)
              os.unlink(src)
      return real_dst
  
imports: import os
  import sys
  import stat
  import fnmatch
  import collections
  import errno
label_desc: Use image node_id 20 for calling a global function with example usage: move(src, dst, copy_function) and returns: real_dst