numpy数组的set_printoptions不适用于numpy ndarray？

Question

I'm trying to use set_printoptions from the answer to the question How to pretty-printing a numpy.array without scientific notation and with given precision?

But I get this error:

Traceback (most recent call last):
  File "neural_network.py", line 57, in <module>
    output.set_printoptions(precision=3)
AttributeError: 'numpy.ndarray' object has no attribute 'set_printoptions'

Apparently, not all numpy arrays are created equal, and what works for a regular numpy.array doesn't work for a numpy.ndarray .

How can I format a numpy.ndarray for priting such as to remove scientific notation?

UPDATE

Changing the call to numpy.set_printoptions() removes the error, but has no effect on the print format of the ndarray contents.

Answer 1

Try numpy.array2string which takes ndarray as input and you can set precision.

Scroll down in below documentation link for examples.

https://docs.scipy.org/doc/numpy-1.10.0/reference/generated/numpy.array2string.html