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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 _GetNameFromProduct(self):
 """Determines the predefined operating system name from the product. Returns: str: operating system name, such as "macOS Mojave" or "Windows XP" or None if the name cannot be determined. This value is used to programmatically link a parser preset to an operating system and therefore must be one of predefined values. """

    product = self.product or ''
    product = product.split(' ')
    product_lower_case = [segment.lower() for segment in product]
    number_of_segments = len(product)

    if 'windows' in product_lower_case:
      segment_index = product_lower_case.index('windows') + 1
      if product_lower_case[segment_index] in ('(r)', 'server'):
        segment_index += 1

      # Check if the version has a suffix.
      suffix_segment_index = segment_index + 1
      if (suffix_segment_index < number_of_segments and
          product_lower_case[suffix_segment_index] == 'r2'):
        return 'Windows {0:s} R2'.format(product[segment_index])

      return 'Windows {0:s}'.format(product[segment_index])

    return None