[Python] Can't fetch weather icons from openweathermap

I have been trying to fetch weather icons from openweathermap api for a python application, but for some reason I am not able to do so.

I am however, able to print the icon as text for e.g. its code like "3d" or "3n" but not the image.

When I try to print the image, the error _tkinter.TclError: image "03n" doesn't exist pops up.

My code is below.

import requests
from tkinter import *

root = Tk()
root.geometry("250x250+0+0")
root.configure(bg='black')
url = 'http://api.openweathermap.org/data/2.5/weather?appid=c73d9cdb31fd6a386bee66158b116cd0&q=karachi&units=metric'

json = requests.get(url).json()
temperature = json['main']['temp']
icon = json['weather'][0]['icon']
#icon1 = 'http://openweathermap.org/img/wn/10d@2x.png'
#print(icon)
root.lab1 = Label(root,image=icon)
root.lab1.pack(side=TOP)
root.lab= Label(text=(root,'{} deg celcius'.format(temperature)),font=("Helvetica 15"), bg='black', fg='white')
root.lab.pack(side=LEFT)

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