code: def close(fignum=None) -> None:
      from matplotlib.pyplot import (
          close as _close,
          get_fignums,
      )
  
      if fignum is None:
          for fignum in get_fignums():
              _close(fignum)
      else:
          _close(fignum)
  
imports: from __future__ import annotations
  import bz2
  from functools import wraps
  import gzip
  import io
  import socket
  import tarfile
  from typing import TYPE_CHECKING, Any, Callable
  import zipfile
  from pandas._typing import FilePath, ReadPickleBuffer
  from pandas.compat import get_lzma_file
  from pandas.compat._optional import import_optional_dependency
  import pandas
  from pandas._testing._random import rands
  from pandas._testing.contexts import ensure_clean
  from pandas.io.common import urlopen
label_desc: Use image node_id 9 for calling a global function with example usage: close(fignum) without return types