class BaseContext

def __contains__(self, key)

    def __contains__(self, key):
        return any(key in d for d in self.dicts)

def __copy__(self)

    def __copy__(self):
        duplicate = copy(super())
        duplicate.dicts = self.dicts[:]
        return duplicate

def __delitem__(self, key)

Delete a variable from the current context

    def __delitem__(self, key):
        "Delete a variable from the current context"
        del self.dicts[-1][key]

def __eq__(self, other)

Compare two contexts by comparing theirs 'dicts' attributes.

    def __eq__(self, other):
        """
        Compare two contexts by comparing theirs 'dicts' attributes.
        """
        if not isinstance(other, BaseContext):
            return NotImplemented
        # flatten dictionaries because they can be put in a different order.
        return self.flatten() == other.flatten()

def __getitem__(self, key)

Get a variable's value, starting at the current context and going upward

    def __getitem__(self, key):
        "Get a variable's value, starting at the current context and going upward"
        for d in reversed(self.dicts):
            if key in d:
                return d[key]
        raise KeyError(key)

def __init__(self, dict_=None)

Initialize self.  See help(type(self)) for accurate signature.

    def __init__(self, dict_=None):
        self._reset_dicts(dict_)

def __iter__(self)

    def __iter__(self):
        return reversed(self.dicts)

def __repr__(self)

Return repr(self).

    def __repr__(self):
        return repr(self.dicts)

def __setitem__(self, key, value)

Set a variable in the current context

    def __setitem__(self, key, value):
        "Set a variable in the current context"
        self.dicts[-1][key] = value

def flatten(self)

Return self.dicts as one dictionary.

    def flatten(self):
        """
        Return self.dicts as one dictionary.
        """
        flat = {}
        for d in self.dicts:
            flat.update(d)
        return flat

def get(self, key, otherwise=None)

    def get(self, key, otherwise=None):
        for d in reversed(self.dicts):
            if key in d:
                return d[key]
        return otherwise

def new(self, values=None)

Return a new context with the same properties, but with only the
values given in 'values' stored.

    def new(self, values=None):
        """
        Return a new context with the same properties, but with only the
        values given in 'values' stored.
        """
        new_context = copy(self)
        new_context._reset_dicts(values)
        return new_context

def pop(self)

    def pop(self):
        if len(self.dicts) == 1:
            raise ContextPopException
        return self.dicts.pop()

def push(self, *args, **kwargs)

    def push(self, *args, **kwargs):
        dicts = []
        for d in args:
            if isinstance(d, BaseContext):
                dicts += d.dicts[1:]
            else:
                dicts.append(d)
        return ContextDict(self, *dicts, **kwargs)

def set_upward(self, key, value)

Set a variable in one of the higher contexts if it exists there,
otherwise in the current context.

    def set_upward(self, key, value):
        """
        Set a variable in one of the higher contexts if it exists there,
        otherwise in the current context.
        """
        context = self.dicts[-1]
        for d in reversed(self.dicts):
            if key in d:
                context = d
                break
        context[key] = value

def setdefault(self, key, default=None)

    def setdefault(self, key, default=None):
        try:
            return self[key]
        except KeyError:
            self[key] = default
        return default