Python: Programmatically resize .jpgs [closed]

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I have a folder of .jpgs files that are all over 2MB in size. I need to upload them to a website but they are WAY too large to show on a website.

Is there a way to resize the actual images in Python &/or to reduce the file size of the jpg开发者_如何学Pythons in python.

Maybe there is a native python library to work with bitmaps &/or jpegs or maybe there is a third party library to do this?

PS: I also know Java & C++, are there any functions(or 3rd party libraries) in those languages that could do this?

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Can't get much easier than with PIL:

from PIL import Image

size = 300, 300
im = Image.open('image.jpg') 
im.thumbnail(size, Image.ANTIALIAS) # thumbnail maintains aspect ratio
im.save('image_resized.jpg')

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This will solve the problem, overwriting all files with the new size:

import cv2
import os

size=50
folder='/home/user/anaconda3/images'

for filename in os.listdir(folder):
    img = cv2.imread(os.path.join(folder,filename), cv2.IMREAD_GRAYSCALE)
    img2=cv2.resize(img,(size,size))
    cv2.imwrite('/home/user/anaconda3/images/'+filename,img2)