printing.py 文件源码

def _init_python_printing(stringify_func, **settings):
    """Setup printing in Python interactive session. """
    import sys
    from sympy.core.compatibility import builtins

    def _displayhook(arg):
        """Python's pretty-printer display hook.

           This function was adapted from:

            http://www.python.org/dev/peps/pep-0217/

        """
        if arg is not None:
            builtins._ = None
            print(stringify_func(arg, **settings))
            builtins._ = arg

    sys.displayhook = _displayhook