human
Solve the following python programming problem given the following code:
@ unittest.skipIf (TRAVIS, 'Skip on Travis (fails even though it passes locally)') 
def test_plot_GeoDataFrame_with_kwargs(self) : 
    '
        Test plotting a simple GeoDataFrame consisting of a series of polygons
        with increasing values using various extra kwargs.
        ' 
    clf () 
    filename = 'poly_plot_with_kwargs.png' 
    ts = np.linspace (0, (2 * pi), 10, endpoint = False) 
    r1 = 1.0 
    r2 = 1.5 
    def make_triangle(t0, t1) : 
        return Polygon ([((r1 * cos (t0)), (r1 * sin (t0))), ((r2 * cos (t0)), (r2 * sin (t0))), ((r1 * cos (t1)), (r1 * sin (t1)))]) 
polys = GeoSeries ([make_triangle (t0, t1) for (t0, t1) in zip (ts, t1 [1 :])]) 
    values = np.arange (len (polys)) 
    df = GeoDataFrame ({ 
        'geometry' : polys, 
        'values' : values, 
}) 
    ax = df.plot (column = 'values', cmap = cm.RdBu, vmin = (+ 2), vmax = None, figsize = (8, 4)) 
    self._compare_images (ax = ax, filename = filename) 

    
    

    Fix the buggy line: polys = GeoSeries ([make_triangle (t0, t1) for (t0, t1) in zip (ts, t1 [1 :])])
assistant
#Here is Python code to fix the buggy line: polys = GeoSeries ([make_triangle (t0, t1) for (t0, t1) in zip (ts, t1 [1 :])])
.

polys = GeoSeries ([make_triangle (t0, t1) for (t0, t1) in zip (ts, ts [1 :])])