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Sample file upload form:

<html>
<body>
   <form enctype = "multipart/form-data"
                     action = "/bin/up.py" method = "post">
   <p>File: <input type = "file" name = "filename" /></p>
   <p><input type = "submit" value = "Upload" /></p>
   </form>
</body>
</html>

Python 3 upload script:

#!/usr/bin/python3
import cgi, os
import cgitb; cgitb.enable()
form = cgi.FieldStorage()
fileitem = form['filename']
if fileitem.filename:
	fn = os.path.basename(fileitem.filename)
	open('/tmp/' + fn, 'wb').write(fileitem.file.read())
	message = 'The file "' + fn + '" was uploaded successfully'

else:
	message = 'No file was uploaded'

print('Content-Type: text/plain\n')
print('Ciao, ' + message)

Fails with SOME unicode characters in file name!