The following Python code will turn your string into a list of strings: import ast ... from array import array >>> text = "a,b,c" >>> text ... ... <看更多>

import numpy as np x = np.array([2, 3, 5, 7, 11, 13]) x * 2. Out[1]:. array([ 4, 6, 10, 14, 22, 26]). This vectorization of operations simplifies the syntax ... ... <看更多>

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