Converting NumPy array into Python List structure?

Question

How do I convert a NumPy array to a Python List (for example [[1,2,3],[4,5,6]] ), and do it reasonably fast?

Peter Hansen · Accepted Answer · 2009-12-27 15:36:24Z

up vote 109 down vote accepted

import numpy as np
>>> np.array([[1,2,3],[4,5,6]]).tolist()
[[1, 2, 3], [4, 5, 6]]

answered Dec 27 '09 at 15:31

Peter Hansen
10k13055

add a comment |

Peter Mortensen · Answer 2 · 2009-12-28 21:22:09Z

up vote 25 down vote

NumPy arrays have a tolist method:

In [1]: arr=np.array([[1,2,3],[4,5,6]])

In [2]: arr.tolist()
Out[2]: [[1, 2, 3], [4, 5, 6]]

Peter Mortensen
9,110106398

answered Dec 27 '09 at 15:32

unutbu
318k32529673

add a comment |

2 Answers 2