<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _del_sub_prop(container, keys):
 """Remove a nested key fro a dictionary. Arguments: container (dict):
 A dictionary which may contain other dictionaries as values. keys (iterable):
 A sequence of keys to attempt to clear the value for. Each item in the sequence represents a deeper nesting. The first key is for the top level. If there is a dictionary there, the second key attempts to get the value within that, and so on. Examples: Remove a top-level value (equivalent to ``del container['key']``). {} Remove a nested value. {'key': {}} """

    sub_val = container
    for key in keys[:-1]:
        if key not in sub_val:
            sub_val[key] = {}
        sub_val = sub_val[key]
    if keys[-1] in sub_val:
        del sub_val[keys[-1]]