<jupyter_start><jupyter_text>How to use data[:,0]?<jupyter_code>_data = [[0,1,2,3],[0,1,2,3]]
_data[:]
_data[0][0]
_data[:,0]<jupyter_output><empty_output><jupyter_text>list is impossible<jupyter_code>import numpy as np
np.array(_data)<jupyter_output><empty_output>
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