<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _bunchify(b):
 """Ensure all dict elements are Bunch."""

    assert isinstance(b, dict)
    b = Bunch(b)
    for k in b:
        if isinstance(b[k], dict):
            b[k] = Bunch(b[k])
    return b