code: def selectExpr(self, *expr):
          
          if len(expr) == 1 and isinstance(expr[0], list):
              expr = expr[0]
          jdf = self._jdf.selectExpr(self._jseq(expr))
          return DataFrame(jdf, self.sql_ctx)
docs: Projects a set of SQL expressions and returns a new :class:`DataFrame`.
  
          This is a variant of :func:`select` that accepts SQL expressions.
  
          >>> df.selectExpr("age * 2", "abs(age)").collect()
          [Row((age * 2)=4, abs(age)=2), Row((age * 2)=10, abs(age)=5)]