[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

core/matplotlib/matplotlib-additional-topics-1.ipynb

@@ -243,7 +243,7 @@
     }
    ],
    "source": [
-    "x = np.array([.25, .20, .40])\n",
+    "x = np.array([0.25, 0.20, 0.40])\n",
     "plt.pie(x, normalize=False);"
    ]
   },