Not able to call python script from matlab using py command

I downloaded the Add - on How to call Python Library function in Matlab.

I also downloaded python version 3.6. When I am using the command pyversion, it is showing correctly that version of python is 3.6.

But when I am trying to call the python code in matlab , it is giving an error - Undefined variable "py" or class "py.call_new1.view_img".

Here is my python code stored in file call_new1.py which is working fine in python editor . What my code does is that it is taking random shapes from the folder E:/baibhav/MPEG7dataset/Distinct_images. Afterwards it is filling a random colour inside that shape from colour_list.After that it is also superimposing a random alphabet from string.ascii_letters on the above obtained image.

import os,random
import string
from PIL import Image,ImageDraw, ImageFont

def random_string_generator(str_size, allowed_chars):
    return ''.join(random.choice(allowed_chars) for x in range(str_size))



def view_img(str):
    print(str)
    
for i in range(1, 10):
        folder1=r"E:/baibhav/MPEG7dataset/Distinct_images"
        a=random.choice(os.listdir(folder1))
        print(a)
        file1 = folder1+'\\'+a
        img1 = Image.open(file1).convert("RGBA")
        #img1.show()


        width, height = img1.size
        center = (int(0.5 * width), int(0.5 * height))
#yellow = (100, 100, 0, 255)
        colour_list = ((255,0,0,255),(0,255,0,255),(0,0,255,255),(210,105,30,255),(255, 255, 0, 255),(0,255,255,255),(128,128,128,255),(255,0,255,255),(100, 100, 0, 255),(100,0,255,255),(0,100,100,255))
        #col = random.choice(colour_list)
        ImageDraw.floodfill(img1, xy=center, value=random.choice(colour_list))

#img3.load()
#img2 = img1;
        #img1.show()


        chars = string.ascii_letters
        size = 1

        print(chars)
        print('Random alphabet is', random_string_generator(size, chars))

 
 
# initialise the drawing context with
# the image object as background
 
        draw = ImageDraw.Draw(img1)

        font = ImageFont.truetype('Roboto-Bold.ttf', size=100)
 
        (x, y) = (150, 150)
        name = random_string_generator(size, chars)
        color = 'rgb(255, 255, 255)' # white color
        draw.text((x, y), name, fill=color, font=font)
 
# save the edited image

        #img1.show()

        img1.save("H:/superimpose/filename"+str(i)+".png", 'PNG')
    

Here is how I am calling the same code in matlab command window :-

        py.call_new1.view_img('hello')

But it is giving me following error:

Undefined variable "py" or class "py.call_new1.view_img".

Please help me with this.Thanks in Advance.

Answer 1

[Jalaj Gambhir]

Hi,

This is a common error that occurs when python is not able to locate your script. You can add the path of your file to the python searchable directories as:

1. In the MATLAB command window check whether the path to your folder containing the file exists. It should be not. To do so, execute

P = py.sys.path

2. For your case, execute the following, to add the path of your folder in python searchable directories:

if count(P,'E:/baibhav/MPEG7dataset/Distinct_images') == 0 
    insert(P,int32(0), 'E:/baibhav/MPEG7dataset/Distinct_images'); 
end

3. Execute

py.sys.path

to check the output again. If the path is added to the list, execute the following for the desired result.

py.call_new1.view_img

Answer 2

[Shrinidhi KR]

Verify all of the points mentioned in this link, either one of these should be causing the issue.