parameters: (top, func, arg)
docstring: Directory tree walk with callback function.
  
      For each directory in the directory tree rooted at top (including top
      itself, but excluding '.' and '..'), call func(arg, dirname, fnames).
      dirname is the name of the directory, and fnames a list of the names of
      the files and subdirectories in dirname (excluding '.' and '..').  func
      may modify the fnames list in-place (e.g. via del or slice assignment),
      and walk will only recurse into the subdirectories whose names remain in
      fnames; this can be used to implement a filter, or to impose a specific
      order of visiting.  No semantics are defined for, or required of, arg,
      beyond that arg is always passed to func.  It can be used, e.g., to pass
      a filename pattern, or a mutable object designed to accumulate
      statistics.  Passing None for arg is common.
docstring_summary: Directory tree walk with callback function.
docstring_tokens: Directory tree walk with callback function .
function: def walk(top, func, arg):
      """Directory tree walk with callback function.
  
      For each directory in the directory tree rooted at top (including top
      itself, but excluding '.' and '..'), call func(arg, dirname, fnames).
      dirname is the name of the directory, and fnames a list of the names of
      the files and subdirectories in dirname (excluding '.' and '..').  func
      may modify the fnames list in-place (e.g. via del or slice assignment),
      and walk will only recurse into the subdirectories whose names remain in
      fnames; this can be used to implement a filter, or to impose a specific
      order of visiting.  No semantics are defined for, or required of, arg,
      beyond that arg is always passed to func.  It can be used, e.g., to pass
      a filename pattern, or a mutable object designed to accumulate
      statistics.  Passing None for arg is common."""
      warnings.warnpy3k("In 3.x, os.path.walk is removed in favor of os.walk.",
                        stacklevel=2)
      try:
          names = os.listdir(top)
      except os.error:
          return
      func(arg, top, names)
      for name in names:
          name = join(top, name)
          if isdir(name):
              walk(name, func, arg)
function_tokens: def walk ( top , func , arg ) : warnings . warnpy3k ( "In 3.x, os.path.walk is removed in favor of os.walk." , stacklevel = 2 ) try : names = os . listdir ( top ) except os . error : return func ( arg , top , names ) for name in names : name = join ( top , name ) if isdir ( name ) : walk ( name , func , arg )