How to solve this error? "AttributeError: 'module' object has no attribute 'wrapAffine'"

edit

I am extremely sorry i asked the question with a typo. Please accept my apologies. I have fixed it now. And yet I still get this error. And its also happening for other programs too.

I run this program:

import cv2
import numpy as np
img = cv2.imread('images/input.jpg')
num_rows, num_cols = img.shape[:2]
rotation_matrix = cv2.getRotationMatrix2D((num_cols/2, num_rows/2), 30, 1)
img_rotation = cv2.warpAffine(img, rotation_matrix, (num_cols, num_rows))
cv2.imshow('Rotation', img_rotation)
cv2.waitKey()

And yet i still get error. The error is:

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

I think both the errors are related. Please help. Thanks in advance.

^^ this is another, unrelated problem. your image simply was not loaded. add a check after imread() like:

if img==None: raise Exception("image not loaded")

(and maybe, that book is just bad ...)

I added the line you told me to add. It still doesn't work. I get the following error:

C:\Python27\python.exe C:/OpenCV_Python/Python_Test.py
Traceback (most recent call last):
  File "C:/OpenCV_Python/Python_Test.py", line 4, in <module>
    if img==None: throw("image not loaded")
NameError: name 'throw' is not defined

I am very sorry to ask an unrelated problem.

I added the line you told me to add. It still doesn't work. I get the following error:

C:\Python27\python.exe C:/OpenCV_Python/Python_Test.py
Traceback (most recent call last):
  File "C:/OpenCV_Python/Python_Test.py", line 4, in <module>
    if img==None: throw("image not loaded")
NameError: name 'throw' is not defined

I am very sorry to ask an unrelated problem.

i got typo's too ;) (now my job to feel sorry)

(please see edited comment above , it's raise Exception in python, not throw..)

Please don't be sorry. You helped me so much thanks a lot. But I tried this:

`if img==None: raise Exception("image not loaded")`

And yet I still get the error:

Traceback (most recent call last):
  File "C:/OpenCV_Python/Python_Test.py", line 4, in <module>
    if img==None: raise Exception("image not loaded")
Exception: image not loaded