Modern Python Standard Library Cookbook

How to do it...

The cgi.FieldStorage class in the standard library already provides all the machinery required to parse multipart data and send it back to you in a way that is easy to handle.

We will create a simple web application (based on WSGIApplication) to show how cgi.FieldStorage can be used to parse the uploaded file and show it back to the user:

import cgi

from web_06 import WSGIApplication
import base64

app = WSGIApplication()

@app.route('/')
def index(req, resp):
    return (
        b'<form action="/upload" method="post" enctype="multipart/form- data">' b' <input type="file" name="uploadedfile"/>' b' <input type="submit" value="Upload">' b'</form>' ) @app.route('/upload') def upload(req, resp): form = cgi.FieldStorage(fp=req.environ['wsgi.input'], ...