Django/venv/lib/python3.7/site-packages/django/http/cookie.py

from http import cookies

# For backwards compatibility in Django 2.1.
SimpleCookie = cookies.SimpleCookie

# Add support for the SameSite attribute (obsolete when PY37 is unsupported).
cookies.Morsel._reserved.setdefault('samesite', 'SameSite')


def parse_cookie(cookie):
    """
    Return a dictionary parsed from a `Cookie:` header string.
    """
    cookiedict = {}
    for chunk in cookie.split(';'):
        if '=' in chunk:
            key, val = chunk.split('=', 1)
        else:
            # Assume an empty name per
            # https://bugzilla.mozilla.org/show_bug.cgi?id=169091
            key, val = '', chunk
        key, val = key.strip(), val.strip()
        if key or val:
            # unquote using Python's algorithm.
            cookiedict[key] = cookies._unquote(val)
    return cookiedict