set_string_function(f, repr=True)
Function to be used to pretty print arrays. The function should expect a single array argument and return a string of the representation of the array. If None, the function is reset to the default NumPy function to print arrays.
If True (default), the function for pretty printing ( __repr__
) is set, if False the function that returns the default string representation ( __str__
) is set.
Set a Python function to be used when pretty printing arrays.
>>> def pprint(arr):
... return 'HA! - What are you going to do now?' ...
>>> np.set_string_function(pprint)
... a = np.arange(10)
... a HA! - What are you going to do now?
>>> _ = a
... # [0 1 2 3 4 5 6 7 8 9]
We can reset the function to the default:
>>> np.set_string_function(None)
... a array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
:None:None:`repr` affects either pretty printing or normal string representation. Note that __repr__
is still affected by setting __str__
because the width of each array element in the returned string becomes equal to the length of the result of __str__()
.
>>> x = np.arange(4)
... np.set_string_function(lambda x:'random', repr=False)
... x.__str__() 'random'
>>> x.__repr__() 'array([0, 1, 2, 3])'See :
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