import qrcode
from PIL import Image
import os
import base64

welcomeCode = "0A1B2C"
fileNamePng = "qr_" + welcomeCode + ".png"

# create QR
img = qrcode.make(welcomeCode)
type(img)  # qrcode.image.pil.PilImage
# resize
newImage = img.resize((73, 73))
#save and reopen
newImage.save(fileNamePng)

with open(fileNamePng, "rb") as img_file:
    b64_string = base64.b64encode(img_file.read())
print(b64_string.decode('utf-8'))