from ucollections import namedtuple

URI = namedtuple('URI', ('cheme', 'netloc', 'path', 'params', 'query', 'fragment'))

def quote(string, safe='_.-~+'):
    """ A simple implementation of URL quoting"""
    string = string.replace(' ', '+')
    result = ""
    for char in string:
        if ('a' <= char <= 'z') or ('A' <= char <= 'Z') or ('0' <= char<= '9') or (char in safe):
            result += char
        else:
            result += "%{:02X}".format(ord(char))
    return result

def urlencode(query, safe='_.-~+'):
    """A simple urlencode function"""
    return '&'.join('{}={}'.format(quote(k, safe), quote(v, safe)) for k, v in query.items())

def urlparse(url):
    """A simple urlparse (cheme, netloc, path, params, query, fragment)"""
    parts = [''] * 6
    for i, sep in enumerate(['://', '#', '?', ';']):
        if sep in url:
            left, right = url.split(sep, 1)
            parts[i], url = left, right
    if '/' in url:
        parts[1], parts[2] = url.split('/', 1)
        parts[2] = '/' + parts[2]
    else:
        parts[1] = url
    return URI(*parts)