python – The object & # 39; tuple & # 39; AttributeError does not have attribute "pie" – matplotlib

I'm trying to create a pie chart with matplotlib to add it to a tkinter graphical interface, but I get this error.

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The code that is

    Labels = 'Pendientes positivas', 'Pendientes negativas', 'Resistencias horizontales'
    sizes = (pendientes_positivas, pendientes_negativas, horizontales)
    graficoTorta = plt.subplots()
    graficoTorta.pie(sizes, labels = Labels)
    canvas = FigureCanvasTkAgg(graficoTorta, frame_Resistencias_M5)
    canvas.get_tk_widget().place(x = 400, y = 60)

Variables in sizes are integers that acquire their values ​​in another part of the program.

In addition, when I open the list of classes, I do not see 'foot & # 39; as an attribute

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I do not know if this has anything to do but I imagine that it should be there.
I am based on a code taken from an example of the documentation of matplotlib

import matplotlib.pyplot as plt

# Pie chart, where the slices will be ordered and plotted counter-clockwise:
labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
sizes = (15, 30, 45, 10)
explode = (0, 0.1, 0, 0)  # only "explode" the 2nd slice (i.e. 'Hogs')

fig1, ax1 = plt.subplots()
ax1.pie(sizes, explode=explode, labels=labels, autopct='%1.1f%%',
        shadow=True, startangle=90)
ax1.axis('equal')  # Equal aspect ratio ensures that pie is drawn as a circle.
plt.show()

What does the following chart generate for me?

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