loop over list and process into groups

[Sneaky Wombat]

[ {'vlan_or_intf': 'VLAN2021'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2022'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi7/33'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2051'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},
 {'vlan_or_intf': 'VLAN2052'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},]

I want it to be converted to:

[{'2021':['Po1','Po306']},{'2022':['Gi7/33','Po1','Po306']},etc etc]

I was going to write a def to loop through and look for certain pre-
compiled regexs, and then put them in a new dictionary and append to a
list, but I'm having trouble thinking of a good way to capture each
dictionary.  Each dictionary will have a key that is the vlan and the
value will be a list of interfaces that participate in that vlan.
Each list will be variable, many containing only one interface and
some containing many interfaces.

I thought about using itertools, but i only use that for fixed data.
I don't know of a good way to loop over variably sized data.  I was
wondering if anyone had any ideas about a good way to convert this
list or dictionary into the right format that I need.  The solution I
come up with will most likely be ugly and error prone, so I thought
i'd ask this python list while I work.  Hopefully I learn a better way
to solve this problem.

Thanks!

I also have the data in a list,

[ 'VLAN4065',
 'Interface',
 'Gi9/6',
 'Po2',
 'Po3',
 'Po306',
 'VLAN4068',
 'Interface',
 'Gi9/6',
 'VLAN4069',
 'Interface',
 'Gi9/6',]