So, I found out the problem The functions in python return None by default So when the while loop turned false it returned None thus throwing an error

import pygame
import json
pygame.init()

c=0
def lcAnim(sfile):
    global c
    with open(sfile) as f:
        data=json.load(f)

    width=data['textureAtlas']['regionWidth']
    height = data['textureAtlas']['regionHeight']
 
    img=pygame.image.load(data['textureAtlas']['texture'])
    if c>=len(data['cycles']['animation0']['frames']):
        c=0
    if c<len(data['cycles']['animation0']['frames']):
        img.set_clip(pygame.Rect(data['cycles']['animation0']['frames'][c-1]*width,animpos*height,width,height))  # Locate the sprite you want
        draw_me = img.subsurface(img.get_clip())  # Extract the sprite you want
        c+=1
        return draw_me
 
```

I found out the problem:

The functions in python return None by default, so when the while loop turned False it returned None thus throwing an error.

import pygame
import json
pygame.init()

c=0
def lcAnim(sfile):
    global c
    with open(sfile) as f:
        data=json.load(f)

    width=data['textureAtlas']['regionWidth']
    height = data['textureAtlas']['regionHeight']
 
    img=pygame.image.load(data['textureAtlas']['texture'])
    if c>=len(data['cycles']['animation0']['frames']):
        c=0
    if c<len(data['cycles']['animation0']['frames']):
        img.set_clip(pygame.Rect(data['cycles']['animation0']['frames'][c-1]*width,animpos*height,width,height))  # Locate the sprite you want
        draw_me = img.subsurface(img.get_clip())  # Extract the sprite you want
        c+=1
        return draw_me