Feature selection python

from sklearn.feature_selection import VarianceThreshold
sel = VarianceThreshold(threshold=(.05))
X = sel.fit_transform(X)

How to feature selection in python

>>> from sklearn.datasets import load_iris
>>> from sklearn.feature_selection import SelectKBest
>>> from sklearn.feature_selection import chi2
>>> X, y = load_iris(return_X_y=True)
>>> X.shape
(150, 4)
>>> X_new = SelectKBest(chi2, k=2).fit_transform(X, y)
>>> X_new.shape
(150, 2)

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