isort --profile black . (#2181)

* updating DIRECTORY.md

* isort --profile black .

* Black after

* updating DIRECTORY.md

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machine_learning/polymonial_regression.py

@@ -1,5 +1,5 @@
-import matplotlib.pyplot as plt
 import pandas as pd
+from matplotlib import pyplot as plt
 from sklearn.linear_model import LinearRegression
 
 # Splitting the dataset into the Training set and Test set