code: def column(self, colregex):
          'Return first column whose Column.name matches colregex.'
          for c in self.columns:
              if re.search(colregex, c.name, regex_flags()):
                  return f column(self, colregex):
          'Return first column whose Column.name matches colregex.'
          for c in self.columns:
              if re.search(colregex, c.name, regex_flags()):
                  return c
docs: Return first column whose Column.name matches colregex.