How to use partitions with BIGREST

Hi, I'm using BIGREST, and I'm able to create a BIGIP object,

f5 = BIGIP(hostname, username, password...)

I'm able to get a list of partitions:

def f5_get_partitions(f5_session: BIGIP) -> List[str]:
    result = f5_session.load("/mgmt/tm/sys/folder")  # type: List[RESTObject]
    partitions: List[str] = []
    for r in result:
        if len(r.properties['fullPath']) < 2:
            # The '/' path should be ignored
            continue
        if r.properties['fullPath'].count('/') > 1:
            # Skip things like /Common/foo and /Common/bar
            continue
        partitions.append(r.properties['name'])
    return partitions

But I haven't figured out how to load something from a partition other than 'Common'. I tried this. It doesn't work:

for partition in partitions:
    f5.load("/mgmt/tm/sys/crypto/cert", partition=partition) 

 The error I get is:

TypeError: load() got an unexpected keyword argument 'partition'

How do you load from a partition?