adicionando legenda de figura fora da caixa [duplicado]

Estou tentando fazer um gráfico de dispersão, com uma legenda de figura fora da caixa, conforme sugerido em How to put the legend outside the plot , mas também estou plotando vários conjuntos de dados Uma barra de cores para vários gráficos de dispersão . O exemplo de trabalho mínimo a seguir tem a maioria dos conjuntos removidos; pode haver 10 conjuntos no script real:

import matplotlib.pyplot as plt
norm = plt.Normalize(55,1954)
plt.scatter([75,75,63,145,47],[0.979687,1.07782,2.83995,4.35468,4.44244], c = [75,75,70,70,70], norm = norm, label = 's1', cmap = 'gist_rainbow', marker = 'o')
plt.scatter([173,65],[0.263218,3.12112], c = [77,68], norm = norm, label = 's2', cmap = 'gist_rainbow', marker = 'v')
plt.colorbar().set_label('score')
plt.legend(loc = "outside center left")
plt.savefig('file.svg', bbox_inches='tight', pad_inches = 0.1)

mas recebo um erro:

/home/con/.local/lib/python3.10/site-packages/matplotlib/projections/__init__.py:63: UserWarning: Unable to import Axes3D. This may be due to multiple versions of Matplotlib being installed (e.g. as a system package and as a pip package). As a result, the 3D projection is not available.
  warnings.warn("Unable to import Axes3D. This may be due to multiple versions of "
Traceback (most recent call last):
  File "/tmp/2Le599Dl8S.py", line 6, in <module>
    plt.legend(loc = "outside center left")
  File "/home/con/.local/lib/python3.10/site-packages/matplotlib/pyplot.py", line 3372, in legend
    return gca().legend(*args, **kwargs)
  File "/home/con/.local/lib/python3.10/site-packages/matplotlib/axes/_axes.py", line 323, in legend
    self.legend_ = mlegend.Legend(self, handles, labels, **kwargs)
  File "/home/con/.local/lib/python3.10/site-packages/matplotlib/legend.py", line 566, in __init__
    self.set_loc(loc)
  File "/home/con/.local/lib/python3.10/site-packages/matplotlib/legend.py", line 703, in set_loc
    raise ValueError(
ValueError: 'outside' option for loc='outside center left' keyword argument only works for figure legends

Eu também tentei:

import matplotlib.pyplot as plt
norm = plt.Normalize(55,1954)
fig = plt.scatter([75,75,63,145,47],[0.979687,1.07782,2.83995,4.35468,4.44244], c = [75,75,70,70,70], norm = norm, label = 's1', cmap = 'gist_rainbow', marker = 'o')
plt.scatter([173,65],[0.263218,3.12112], c = [77,68], norm = norm, label = 's2', cmap = 'gist_rainbow', marker = 'v')
plt.colorbar().set_label('score')
fig.legend(loc = "outside center left")
plt.savefig('file.svg', bbox_inches='tight', pad_inches = 0.1)

mas isso produz outro problema:

/home/con/.local/lib/python3.10/site-packages/matplotlib/projections/__init__.py:63: UserWarning: Unable to import Axes3D. This may be due to multiple versions of Matplotlib being installed (e.g. as a system package and as a pip package). As a result, the 3D projection is not available.
  warnings.warn("Unable to import Axes3D. This may be due to multiple versions of "
Traceback (most recent call last):
  File "/tmp/2Le599Dl8S.py", line 6, in <module>
    fig.legend(loc = "outside center left")
AttributeError: 'PathCollection' object has no attribute 'legend'

Também olhei Qual é a necessidade de plt.figure() no matplotlib? , mas não há nada lá sobre lendas, então aquela postagem não resolveu meu problema. Também não apareceu na pesquisa do Google.