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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def strictly_positive_int_or_none(val):
 """Parse `val` into either `None` or a strictly positive integer."""

    val = positive_int_or_none(val)
    if val is None or val > 0:
        return val
    raise ValueError('"{}" must be strictly positive'.format(val))