How can I split a list of dictionaries in separate lists of dictionaries based on some condition?

I am new to python, and I am trying to split a list of dictionaries into separate lists of dictionaries based on some condition.

This is how my list looks like this:

[{'username': 'AnastasiadesCY',
  'created_at': '2020-12-02 18:58:16',
  'id': 1.33421029132062e+18,
  'language': 'en',
  'contenttype': 'text/plain',
  'content': 'Pleased to participate to the international conference in support of the Lebanese people. Cypriot citizens, together with the Government 🇨🇾, have provided significant quantities of material assistance, from the day of the explosion until today.\n\n#Lebanon 🇱🇧'},
 {'username': 'AnastasiadesCY',
  'created_at': '2020-11-19 18:13:06',
  'id': 1.32948788307022e+18,
  'language': 'en',
  'contenttype': 'text/plain',
  'content': '#Cyprus stand ready to support all efforts towards a coordinated approach of vaccination strategies across Europe, that will prove instrumental in our fight against the pandemic.\n\nUnited Against #COVID19 \n\n#EUCO'},...

I would like to split and group all list's elements that have the same username into separate lists of dictionaries. The elements of the list - so each dictionary - are ordered by username.

Is there a way to loop over the dictionaries and append each element to a list until username in "item 1" is equal to username in "item 1 + 1" and so on?

Thank you for your help!