What are standarization and normalization? Test with iris data set in Scikit-learn

standarizationdecision.py

from sklearn.neighbors import KNeighborsClassifier

fig, axes = plt.subplots(1, 3, figsize=(12, 3))
for ax, n_neighbors in zip(axes, [1, 3, 6]):
    clf = KNeighborsClassifier(n_neighbors=n_neighbors)
    decision_boundary(df_s, clf, ax)