<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def cleanup_all(data_home=None):
 """ Cleans up all the example datasets in the data directory specified by ``get_data_home`` either to clear up disk space or start from fresh. """

    removed = 0
    for name, meta in DATASETS.items():
        _, ext = os.path.splitext(meta['url'])
        removed += cleanup_dataset(name, data_home=data_home, ext=ext)

    print(
        "Removed {} fixture objects from {}".format(removed, get_data_home(data_home))
    )