pretty.py 文件源码

def _dict_pprinter_factory(start, end, basetype=None):
    """
    Factory that returns a pprint function used by the default pprint of
    dicts and dict proxies.
    """
    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('{...}')
        step = len(start)
        p.begin_group(step, start)
        keys = obj.keys()
        # if dict isn't large enough to be truncated, sort keys before displaying
        if not (p.max_seq_length and len(obj) >= p.max_seq_length):
            try:
                keys = sorted(keys)
            except Exception:
                # Sometimes the keys don't sort.
                pass
        for idx, key in p._enumerate(keys):
            if idx:
                p.text(',')
                p.breakable()
            p.pretty(key)
            p.text(': ')
            p.pretty(obj[key])
        p.end_group(step, end)
    return inner