How to split input data to train & test set

2017 10 3
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更新时间：2017 10 7
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Hi;
Is there any functionexist to divide data into train_data & test_data
I have below data:Currently I do it manually,
I want to divide the data in to 70% (train data) and 30% test data. and how to overcome fraction(suppose if data size 11, 70%-->7.7, in this kind of situation take nearest roundoff whole number i.e., 8, test data is 3)
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