numpy

创建一个空数组

import numpy as np
a = numpy.zeros(shape=(5,2))
b = numpy.ones(shape=(5,2))
c = numpy.random.random((5,2))

d = numpy.array([[1, 2, 3], [4, 5, 6]])

对某列或者某行进行排序

# column
data = data[data[:, 2].argsort()]
# row
data = data.T(data.T[:, 2].argsort()).T
# or
data = data[:,data[2].argsort()]