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# Lists
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def is_seq(value):
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    return (isinstance(value, list) or isinstance(value, tuple)
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        or isinstance(value, set))
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def mk_seq(value):
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    if not is_seq(value): value = [value]
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    return value
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def clear(list_):
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    while True:
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        try: list_.pop()
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        except IndexError: break
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def uniqify(list_):
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    '''Removes duplicates from an iterable. Preserves order.'''
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    existing = set()
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    new_list = []
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    for value in list_:
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        if value not in existing:
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            existing.add(value)
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            new_list.append(value)
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    return new_list
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