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class LengthError(BaseException):
pass
class MirrorError(BaseException):
pass
def raise_valueerror_if_data_is_not_lists_or_tuples(lists):
"""Check that `lists` is a list of lists: If not, raise an exception."""
def is_list_or_tuple(item):
return type(item) == type([]) or type(item) == type(tuple)
if (not is_list_or_tuple(lists)) or (not all(map(is_list_or_tuple, lists))):
raise ValueError("Expected list or tuple")
def nearest(lists, i, j):
raise_valueerror_if_data_is_not_lists_or_tuples(lists)
return None
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