I know that I can iterate through the cookies in a cookiejar, and this would allow me to find a cookie with a particular name - but does the CookieJar object itself have any methods I can call to get a certain cookie by name?
It just saves me having to write a helper method that already exists.
Yes, the __iter__ method will go through each cookie in CookieJar.
for cookie in cj:
print cookie.name, cookie.value, cookie.domain #etc etc
A cookie is not just a name and value pair. In its long list (17) of properties, there is domain and path. A domain value of .ibm.com would be applicable to the website mail.ibm.com for example. A domain value of ibm.com and path value of /abc would not apply to the web page ibm.com/index.htm. So by supplying the name alone is insufficient to find the value of an applicable cookie in CookieJar.
Though the __iter__ method will return a list of cookie objects easily, example list(cj), the internal structure of CookieJar is not a simple list. Internals about the CookieJar class is here.
You can also use dict_from_cookiejar, which returns a key/value dictionary from a CookieJar. Something like:
my_cookies = requests.utils.dict_from_cookiejar(s.cookies)
and then access your cookie value by key.
It's undocumented internals, but you can access cookies directly like this: cookiejar._cookies[domain][path][name]
cookielib.CookieJar?
you can convert jar to a list and process that, e.g. {i.name: i for i in list(j)}
and btw, j._cookies is actually a dict-dict already, though not completely trivially indexed.
cookie jar file?
I thought those were plain text files...
来源：https://stackoverflow.com/questions/8175928/get-cookie-from-cookiejar-by-name