What does stratify=y mean ?

Question

from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.30, random_state=1, stratify=y)

Answer 1

https://datascience.stackexchange.com/questions/40584/meaning-of-stratify-parameter

Look this