This is code I used in Windows. It works.
for item in COOKIES.split(';'):
name,value = item.split('=', 1)
name=name.replace(' ', '').replace('\r', '').replace('\n', '')
value = value.replace(' ', '').replace('\r', '').replace('\n', '')
cookie_dict={
'name':name,
'value':value,
"domain": "", # Google Chrome
"expires": "",
'path': '/',
'httpOnly': False,
'HostOnly': False,
'Secure': False
}
self.driver_.add_cookie(cookie_dict)