This page lists some integrated development environments for programming Python in general and Trac in particular.
Python Tools for Visual Studio
Python Tools for Visual Studio (PTVS) turns Visual Studio into a Python IDE. It supports Intellisense (code completion), debugging and such.
You can run Trac in debug mode and even debug remotely plugin code. But in a first try it doesn't work reliably.
PyCharm Free Community Edition is a Python IDE by JetBrains available under the Apache 2 license.
It supports code completion, on-the-fly error highlighting, automated code refactorings, debugging.