list object has no attribute shape

Question

how to create an array to numpy array   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    I am getting error as   AttributeError   list  object has no attribute  shape    So  I think I need to convert my X to numpy array

User · Answer

Alternatively  you can use np shape       For instance   import numpy as np  a  1 2 3   and np shape a  will give an output of  3

User · Answer

if the type is list  use len list  and len list 0   to get the row and column   l     1 2 3 4    0 1 3 4     len l  will be 2 len l 0   will be 4

User · Answer

Use numpy array to use shape attribute    gt  gt  gt  import numpy as np  gt  gt  gt  X   np array             -9 035250067710876    7 453250169754028    33 34074878692627              -6 63700008392334    5 132999956607819    31 66075038909912              -5 1272499561309814    8 251499891281128    30 925999641418457           gt  gt  gt  X shape  3L  3L  1L    NOTE X shape returns 3-items tuple for the given array   n  T    X shape raises ValueError

User · Answer

firstly u have to import numpy library  refer code for making a numpy array  shape only gives the output only if the variable is attribute of numpy library  in other words it must be a np array or any other data structure of numpy  Eg     gt  gt  gt  import numpy  gt  gt  gt  a numpy array   1 1   1 1     gt  gt  gt  a shape  2  2

User · Answer

If you have list  you can print its shape as if it is converted to array  import numpy as np print np asarray X  shape

User · Answer

list object in python does not have  shape  attribute because  shape  implies that all the columns  or rows  have equal length along certain dimension    Let s say list variable a has following properties           a     2  3  4             0  1             87  8  1    it is impossible to define  shape  for variable  a   That is why  shape  might be determined only with  arrays  e g   b   numpy array   2  3  4                   0  1  22                   87  8  1      I hope this explanation clarifies well this question

User · Answer

import numpy X   numpy array the big nested list you had    It s still not going to do what you want  you have more bugs  like trying to unpack a 3-dimensional shape into two target variables in test

[python] 'list' object has no attribute 'shape'

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