multiset.py 文件源码

def _as_mapping(iterable):
        if isinstance(iterable, BaseMultiset):
            return iterable._elements
        if isinstance(iterable, dict):
            return iterable
        if isinstance(iterable, _all_basic_types):
            pass  # create dictionary below
        elif isinstance(iterable, Mapping):
            return iterable
        elif not isinstance(iterable, Iterable):
            raise TypeError("'%s' object is not iterable" % type(iterable))
        mapping = dict()
        for element in iterable:
            if element in mapping:
                mapping[element] += 1
            else:
                mapping[element] = 1
        return mapping