code: def guess_extension(type, strict=True):
      """Guess the extension for a file based on its MIME type.
  
      Return value is a string giving a filename extension, including the
      leading dot ('.').  The extension is not guaranteed to have been
      associated with any particular data stream, but would be mapped to the
      MIME type `type' by guess_type().  If no extension can be guessed for
      `type', None is returned.
  
      Optional `strict' argument when false adds a bunch of commonly found,
      but non-standard types.
      """
      if _db is None:
          init()
      return _db.guess_extension(type, strict)
  
imports: import os
  import sys
  import posixpath
  import urllib.parse
label_desc: Use image node_id 3 for calling a global function with example usage: guess_extension(type, strict) and returns: _db