Fixing the error: attributeerror: 'list' object has no attribute 'shape'

Question

I get the error message:

AttributeError: 'list' object has no attribute 'shape'

Has anyone ever faced this problem? How to troubleshoot the “attributeerror: 'list' object has no attribute 'shape'.” The problem appears when I try to operate the following program:

def test(X, N):
  [n,T] = X.shape
  print "n : ", n
  print "T : ", T
 
 
 
 if __name__=="__main__":
 
  X = [[[-9.035250067710876], [7.453250169754028], [33.34074878692627]], [[-6.63700008392334], [5.132999956607819], [31.66075038909912]], [[-5.1272499561309814], [8.251499891281128], [30.925999641418457]]]
  N = 200
  test(X, N)

dttutoria · Accepted Answer

The cause: For the provided array, X.shape results a 3-item tuple, so [n, T] = X.shape generates a ValueError: 'list' object has no attribute 'shape'.

Solution: Shape attribute should be used with numpy.array.

>>> import numpy as np
>>> X = np.array([
... [[-9.035250067710876], [7.453250169754028], [33.34074878692627]],
... [[-6.63700008392334], [5.132999956607819], [31.66075038909912]],
... [[-5.1272499561309814], [8.251499891281128], [30.925999641418457]]
... ])
>>> X.shape
(3L, 3L, 1L)

Arthur Henry · Answer

Alternativ, you could use np.shape(...)

Take, for example:

import numpy as np
a=[1,2,3]

np.shape(a) will output (3,)

Sign Up

Sign In

Forgot Password

ITtutoria Latest Questions

Fixing the error: attributeerror: ‘list’ object has no attribute ‘shape’