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Track changes to mutable data types.

Project description

Build Status Documentation Status Version Info


A library for Python 3.6 and above that can track changes to mutable data types.

With spectate, complicated protocols for managing updates don't need to be the outward responsibility of a user and can instead be done automagically in the background. For instance, syncing the state between a server and client can controlled by spectate, so users don't have to.



  • stable
pip install spectate
  • pre-release
pip install spectate --pre
  • master
pip install git+
  • developer
git clone && cd spectate/ && pip install -e . -r requirements.txt

At A Glance

If you're using Python 3.6 and above, create a model object

from spectate import mvc

l = mvc.List()

Register a view function to it that observes changes

def printer(l, events):
    for e in events:

Then modify your object and watch the view function react

l[0] = 1
l.extend([2, 3])
{'index': 0, 'old': Undefined, 'new': 0}
{'index': 0, 'old': 0, 'new': 1}
{'index': 1, 'old': Undefined, 'new': 2}
{'index': 2, 'old': Undefined, 'new': 3}

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