Plain WSGI API for converting text in to sarcasm/mocking format

sarcasmify_wsgi.py

from urllib.parse import parse_qs

def sarcasmify(text):
    new_text = ''
    flip = True
    for i in range(len(text)):
        char = text[i]
        if flip:
            new_text += char.lower()
        else:
            new_text += char.upper()
        
        # Only flip if the current char was an alpha character
        if char.isalpha():
            flip = not flip

    return new_text


def respond(start_response, status, body):
    start_response(status, [
        ('Content-Type', 'text/plain'),
        ('Content-Length', str(len(body)))
    ])
    return [body]
    

def handle_get(environ, start_response):
    params = parse_qs(environ['QUERY_STRING'], True)
    param = params.get('text', [])
    if param:
        text = sarcasmify(param[0])
        status = '200 OK'
        body = f'{text}'.encode('utf-8')
    else:
        status = '400 Bad Request'
        body = b'Bad Request. Missing parameter "text"'

    respond(start_response, status, body)
    return [body]
  

def application(environ, start_response):
    if environ.get('REQUEST_METHOD') == 'GET':
        return handle_get(environ, start_response)

    body = b'Method Not Allowed'
    start_response('405 Method Not Allowed', [
        ('Content-Type', 'text/plain'),
        ('Content-Length', str(len(body)))
    ])
    return [body]