pretty.py 文件源码

def _seq_pprinter_factory(start, end, basetype):
    """
    Factory that returns a pprint function useful for sequences.  Used by
    the default pprint for tuples, dicts, and lists.
    """
    def inner(obj, p, cycle):
        typ = type(obj)
        if basetype is not None and typ is not basetype and typ.__repr__ != basetype.__repr__:
            # If the subclass provides its own repr, use it instead.
            return p.text(typ.__repr__(obj))

        if cycle:
            return p.text(start + '...' + end)
        step = len(start)
        p.begin_group(step, start)
        for idx, x in p._enumerate(obj):
            if idx:
                p.text(',')
                p.breakable()
            p.pretty(x)
        if len(obj) == 1 and type(obj) is tuple:
            # Special case for 1-item tuples.
            p.text(',')
        p.end_group(step, end)
    return inner