Why do I get the typeerror: unhashable type: 'numpy.ndarray' error?

Question

How to solve the problem - typeerror: unhashable type: 'numpy.ndarray'? I have the detail here:

above = range(18000, 18060, 5)
 
 data = np.loadtxt(open('data.txt'), delimiter=None)
 
 energies = (np.hsplit(data, 3))[0]
 
 slice = set(energies)&set(above)

While I run it, I found the warning message:

Traceback (most recent call last):
  File "<pyshell#27>", line 1, in <module>
  set(energies)&set(above)
 TypeError: unhashable type: 'numpy.ndarray

That is my question in my midterm exam, and it is urgent. I searched the solutions on some websites, but I don’t get it. I may miss any line or other changes. I appreciate your assistance!

dhtutoria · Accepted Answer

The cause: The variable energies likely have unacceptable shape: Solution: Instead of writing by your approach:

>>> data 
array([[ 1., 2., 3.], 
[ 3., 4., 5.], 
[ 5., 6., 7.], 
[ 8., 9., 10.]]) 
>>> hsplit(data,3)[0] 
array([[ 1.], 
[ 3.], 
[ 5.], 
[ 8.]])

Probably you use this way:

>>> data[:,0] 
array([ 1., 3., 5., 8.])

Agathe Andrieu · Answer

numpy.ndarray can contain any element, e.g. int, float, string etc. If necessary, check the type and convert.

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Why do I get the typeerror: unhashable type: ‘numpy.ndarray’ error?