class_docstr: shared implementation for filesystem path objects.
code: def isfile(self):
      return self.check(file=1)
  
imports: import warnings
  import os
  import sys
  import posixpath
  import fnmatch
  import py
label_desc: Use image node_id 21 for calling the PathBase obj's underlying member method code with example usage: obj.isfile() and returns: self