':' Slice notation is possible using':'. If a is an array, a [i: j: k] means a partial array of k-1 skipped from the i-th element to the j-1st element. i, j, k are optional, the default value of i is 0, the default value of j is np.alen (a), that is, the length along the 0 axis of a, and the default value of k is 1.
[:4]
Extract column names from 0 to 3 with Pandas features = df.columns[:4]
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