multipart form-dataで画像ファイルをアップするとき。

multipart form-data用の出力関数

def _enc_image(filename, max_size):
	try:
		if os.path.getsize(filename) > (max_size * 1024):
			print 'File is too big, must be less than %d' % (max_size * 1024) 
	except os.errno, e:
		print 'Unable to access file, %s' % e

	file_type = mimetypes.guess_type(filename)
	if file_type is None:
		print 'Could not datermine file type'
	file_type = file_type[0]
	if file_type not in ['image/gif', 'image/jpeg', 'image/png']:
		print 'Invalid file type for image: %s' % filename

	fp = open(filename, 'rb')
	BOUNDARY = 'IlOvEpYtHoN'
	body = []
	body.append('--' + BOUNDARY)
	body.append('Content-Disposition: form-data; name="image"; filename="%s"' % filename)
	body.append('Content-Type: %s' % file_type)
	body.append('')
	body.append(fp.read())
	body.append('--' + BOUNDARY + '--')
	body.append('')
	fp.close()
	body = '\r\n'.join(body)

	headers = {
		'Content-Type': 'multipart/form-data; boundary=%s' % BOUNDARY,
		'Content-Length': len(body)
	}

	return headers, body