class BlockContext

def __init__(self)

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

    def __init__(self):
        # Dictionary of FIFO queues.
        self.blocks = defaultdict(list)

def __repr__(self)

Return repr(self).

    def __repr__(self):
        return f"<{self.__class__.__qualname__}: blocks={self.blocks!r}>"

def add_blocks(self, blocks)

    def add_blocks(self, blocks):
        for name, block in blocks.items():
            self.blocks[name].insert(0, block)

def get_block(self, name)

    def get_block(self, name):
        try:
            return self.blocks[name][-1]
        except IndexError:
            return None

def pop(self, name)

    def pop(self, name):
        try:
            return self.blocks[name].pop()
        except IndexError:
            return None

def push(self, name, block)

    def push(self, name, block):
        self.blocks[name].append(block)