def validate_col(self, itemsize=None):
<EOL>if _ensure_decoded(self.kind) == '<STR_LIT:string>':<EOL><INDENT>c = self.col<EOL>if c is not None:<EOL><INDENT>if itemsize is None:<EOL><INDENT>itemsize = self.itemsize<EOL><DEDENT>if c.itemsize < itemsize:<EOL><INDENT>raise ValueError(<EOL>"<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>".format(<EOL>itemsize=itemsize, cname=self.cname,<EOL>c_itemsize=c.itemsize))<EOL><DEDENT>return c.itemsize<EOL><DEDENT><DEDENT>return None<EOL>
validate this column: return the compared against itemsize