python - 从 numpy ndarray 中的每个维度获取特定元素

Question

如何从 numpy ndarray 中的每个维度获取第一个元素？

import numpy
A = numpy.array([['a','b','c'],['d','e','f'],['g','h','i']])

结果应该是:

Result = ['a','d','g']

Answer 1

>>> import numpy
>>> A = numpy.array([['a','b','c'],['d','e','f'],['g','h','i']])
>>> A[:,0]
array(['a', 'd', 'g'],
      dtype='|S1')
>>> A[...,0]
array(['a', 'd', 'g'],
      dtype='|S1')

参见 Indexing (basic) - NumPy Manual , Indexing - NumPy Manual .