parametro c do plt.scattter não está aceitando o teste_y

Ao rodar o seguinte comando do curso Machine Learnig : Introdução a classificação com sklearn, Aula3, topico 4

plt.scatter(teste_x.horas_esperadas, teste_x.preco, c=teste_y)

Aparece o seguinte erro:

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
/usr/local/lib/python3.7/dist-packages/matplotlib/axes/_axes.py in _parse_scatter_color_args(c, edgecolors, kwargs, xsize, get_next_color_func)
   4238             try:  # Is 'c' acceptable as PathCollection facecolors?
-> 4239                 colors = mcolors.to_rgba_array(c)
   4240             except ValueError:

9 frames
ValueError: Invalid RGBA argument: 'finalizado'

During handling of the above exception, another exception occurred:

ValueError                                Traceback (most recent call last)
/usr/local/lib/python3.7/dist-packages/matplotlib/axes/_axes.py in _parse_scatter_color_args(c, edgecolors, kwargs, xsize, get_next_color_func)
   4244                 # severe failure => one may appreciate a verbose feedback.
   4245                 raise ValueError(
-> 4246                     f"'c' argument must be a color, a sequence of colors, or "
   4247                     f"a sequence of numbers, not {c}")
   4248             else:

ValueError: 'c' argument must be a color, a sequence of colors, or a sequence of numbers, not       finalizado
1508           1
1135           1
228            0
1041           1
2107           1
...          ...
1841           1
1992           0
987            0
2064           1
292            0

[1618 rows x 1 columns]