def popitem(self):
        try:
            return self.maps[0].popitem()
        except KeyError:
            raise KeyError('No keys found in the first mapping.')
Format a metre count as a human readable length.
dataset/ETHPy150Open ionelmc/python-aspectlib/src/aspectlib/py2chainmap.py/ChainMap.popitem--crossover with--dataset/ETHPy150Open xolox/python-humanfriendly/humanfriendly/__init__.py/format_length