Breast Cancer Classifier using K-Nearest Neighbor classifier

Breast Cancer Classifier using K-Nearest Neighbor classifier
In this part of the code:
training_data, validation_data, training_labels, validation_labels = train_test_split(breast_cancer_data.data, breast_cancer_data.target, test_size=0.2, random_state=80)

How to choose random_state value?
What is the impact of choosing this value ‘random_state’ ?

Please help me to understand better
Thank you.

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