How to create Captcha image from raw data

Question

I got the captcha raw data, need to convert it into an image(png or jpg). The browser can create the image from raw data, the same operation I want to do using Python. please suggest

{
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}

Answer 1

You have received a JSON structure containing the captcha field, and its value is an SVG document. Some of the ways to render that to a bitmap image are discussed in this question, and I would personally choose this answer. Here's a small code sample:

import cairosvg
import io
import json

# fetch your JSON
json_string = web_fetch('https://example.com/captcha')

# parse it into a python object and extract the SVG document
svg = json.loads(json_string)['captcha']

# note: your SVG document declares its size to be 150x50 pixels,
# which may be too small for some users to see; consider varying the `scale` parameter

# write image to file
cairosvg.svg2png(bytestring=svg, write_to='captcha_output.png', scale=3)

# or to memory to use it later
buf = io.BytesIO()
cairosvg.svg2png(bytestring=svg, write_to=buf, scale=3)

For more info, check out the cairosvg docs.