import matplotlib.pyplot as plt
from matplotlib.patches import Circle
import mpl_toolkits.mplot3d.art3d as art3d

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

fig = plt.figure()
ax = fig.gca(projection='3d')

for i in ["x", "y", "z"]:
    cir = Circle((0.5, 0.5), 0.2, color='red')
    ax.add_patch(cir)
    art3d.pathpatch_2d_to_3d(cir, z=0, zdir=i)

plt.show()