List of features of the Pyzo IDE


  • Powerful introspection (see below).
  • Allows various ways to interactively run code (see below).
  • Using an intuitive shortcut editor, a shortcut can be created for any item in the menu.
  • Various handy tools, plus the ability to make your own.
  • Choose between different Qt themes.
  • Full Unicode support in both editor and shell.


  • The pythonic shells run in a subprocess and can therefore be interrupted or killed.
  • Several shells can be used simultaneously, and can be of different Python versions (v2.4 - v3.x).
  • Pypy is supported, Jython and IronPython may be too (untested).
  • Command history.
  • Text in the shell can be selected and copied. Text can be pasted to the command line.
  • The original stdout and stderr are printed to the shell (for C programs that print to file 1 or 2).
  • It is guaranteed that no stdout or stderr messages are dropped; if the shell cannot keep up with displaying messages, the kernel is slowed down automatically (try while True: print(time.time())).
  • Debugging next/step/continue.
  • Post-mortem debugging.
  • Enables using several GUI toolkits interactively: PySide, PyQt4, Tk, wx, fltk, GTK.
  • Supports removing previously printed text by using the backspace char.
  • Supports magic commands similar to IPython.
  • You can create multiple shell configurations (different Python version, different GUI integration, etc.)
  • Use ‘pip’ or ‘conda’ commands to manage your packages.


  • Supports auto indentation.
  • Automatically determines the indentation width when loading a file.
  • Matlab-style cell system to mark code sections (by starting a line with ‘##’).
  • Syntax highlighting for Python, Cython, C, and more to come.
  • todo: Syntax schemes easily editable and extendable
  • Supports commenting and uncommenting selected lines.
  • Drag-‘n-drop files or directories to open them.
  • Find/Replace (also supports regular expressions).
  • The line ending style can be changed.
  • Optionally use tabs, or insert tabs as spaces.
  • Indentation guides.
  • todo: Brace matching.
  • View whitespace / line endings.
  • Zooming.
  • Undo / redo.
  • Highlighting of current line.
  • Long line indicator.
  • Chooice of multiple fonts, Pyzo comes with two beautiful fonts by default.
  • Breakpoints for debugging.


  • Introspection information is queried from the active shell, and from the source code (by continuously parsing the file in a separate thread). (This is going to be integrated with the syntax parsing)
  • Auto completion for any object in the active Python session and all __builtins__.
  • Optional auto completion for Python keywords.
  • Auto completion for functions, classes, and class attributes defined in the current file in the editor (taking inheritance into account, even if a super class is defined in the shell).
  • Shows signature of functions (from the shell or from the source) using a call-tip.
  • Interactive help for all objects in the active Python session by moving up/down the auto completion list, by double-clicking on a name, or by filling in the name directly.
  • Interactive help show the docstrings of properties (rather than of the returned object).

Interactivity (ways to run code)

  • Run code by typing directly in the interactive shell.
  • Run selection: * Run current line if there is no selection. * Evaluate selection if there is a selection and it is on one line. * Run all (whole) selected lines if selection spans multiple lines.
  • Run cell (a cell is the piece of code between two lines starting with ‘##’).
  • Run current file.
  • Run main file.
  • Run current file as a script.
  • Run main file as a script.

Standard tools

  • File browser: List all files in your projects by bookmarking the directories of your projects. Easy switching between projects.
  • Source structure: a tool that lists the structure of the source in a tree widget. It can list classes, functions (and methods), import statements, cells, and todo items.
  • Interactive help: a tool that displays help information interactively (on selection and scrolling through an autocompletion list.)
  • Workspace: lists all variables (also in debug mode).
  • File browser: browse files and search inside files.
  • Logger: a logger shell that displays Pyzo’s log messaged and can be used for development or for changing advanced settings.
  • <We hope to receive useful contributions from users to add as standard tools.>