print numpy array for copy and paste

Question

Sometimes, I would like to print a numpy array just to copy it from the command line into somewhere else. The standard __repr__ is close, but missing the commas:

import numpy as np

a = np.random.rand(5, 2)
print(a)

[[0.66585668 0.5793219 ]
 [0.28048686 0.11019737]
 [0.41359919 0.69354774]
 [0.02062253 0.85507001]
 [0.05443759 0.51366551]]

Any hints?

Does this answer your question? string representation of a numpy array with commas separating its elements gives print(repr(a)) — G. Anderson
– G. Anderson, Commented Apr 15, 2021 at 16:35
Reversing the problem: Numpy equivalent of pandas.read_clipboard? — Stef
– Stef, Commented Feb 15, 2024 at 14:32

Zach Allen · Accepted Answer · 2021-04-15 16:41:56Z

1

Assuming your desired output is the following:

[
    [0.5838947919313026, 0.05795999970550392],
    [0.9737053546477267, 0.7160755144818707],
    [0.17361370495727824, 0.09849691691484186], 
    [0.863423476768234, 0.7065666761268419],
    [0.18712559034118503, 0.21525050659592326]
]

You can use a list comprehension and the list constructor to do this:

import numpy as np
a = np.random.rand(5, 2)
print([list(i) for i in a])

answered Apr 15, 2021 at 16:41

Zach Allen

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1 Comment

Nico Schlömer Over a year ago

This is better achieved with a.tolist().

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