get virtual list based on vip/destination filter [request params]?

I'm confused why your filter ends with $destination+eq+vip

Take a look at https://www.odata.org/documentation/odata-version-2-0/uri-conventions/#FilterSystemQueryOption for the odata syntax

Your string handling is also not correct

My thinking is that from a Python perspective you want:

partition = "myPartition"
destination="1.2.3.4:443"
virtuals = mgmt.tm.ltm.virtuals.get_collection(requests_params={    'params': 'expandSubcollections=true&$filter=partition+eq+' + partition + 'and+destination+eq+' + vip)}

A good way to test this is to create the filter string and then insert it into the command, so you can print it out first

eg

partition = "myPartition"
destination="1.2.3.4:443"
filterString = 'expandSubcollections=true&$filter=partition+eq+' + partition + 'and+destination+eq+' + vip
print("filterString:" + filterString) 
virtuals = mgmt.tm.ltm.virtuals.get_collection(requests_params={    'params': filterString)}

You can also use my iCR python module for a simple script