【Python学习笔记】20:numpy广播、分段函数、频次统计

用int64()取整 >>> x=np.random.rand(10)*50 >>> x array([ 23.22184111, 32.50075356, 42.89971884, 29.7081743 , 9.59936762, 13.48713739, 31.01003042, 9.83144093, 32.46756683, 32.9077
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