s.
:type include_linenos: bool

:param ast_state: If true, includes information derived from
    the whole AST like local and global variables.
:type ast_state: bool

:param indent: A string to use to indent the output string.
:type indent: str

:param max_depth: If set to a positive integer, won't return
    nodes deeper than max_depth in the string.
:type max_depth: int

:param max_width: Attempt to format the output string to stay
    within this number of characters, but can exceed it under some
    circumstances. Only positive integer values are valid, the default is 80.
:type max_width: int

:returns: The string representation of the AST.
:rtype: str
ra