docstr: reverse polynomial coefficients
          
docstr_tok: ["reverse","polynomial","coefficients"]
code: def flip(self):
      """reverse polynomial coefficients"""
      return LagPolynomial(self.coef[::-1])
  
file_path: statsmodels/statsmodels/examples/tsa/lagpolynomial.py
imports: import numpy
  from numpy import polynomial
label_desc: Use image node_id 3 for calling the LagPolynomial obj's underlying member method code with example usage: obj.flip() and returns: LagPolynomial