prompt_toolkit is a library for building powerful interactive command lines
and terminal applications in Python.
Read the documentation on readthedocs.
ptpython is an interactive Python Shell is build on top of prompt-toolkit.
prompt_toolkit could be a replacement for GNU readline, but it can be much
more than that.
Some features:
- Pure Python.
- Syntax highlighting of the input while typing. (For instance, with a Pygments lexer.)
- Multi-line input editing.
- Advanced code completion.
- Both Emacs and Vi key bindings. (Similar to readline.)
- Reverse and forward incremental search.
- Runs on all Python versions from 2.6 up to 3.4.
- Works well with Unicode double width characters. (Chinese input.)
- Selecting text for copy/paste. (Both Emacs and Vi style.)
- Mouse support for cursor positioning and scrolling.
- Auto suggestions. (Like fish shell.)
- Multiple input buffers.
- No global state.
- Lightweight, the only dependencies are Pygments, six and wcwidth.
- Code written with love.
- Runs on Linux, OS X, OpenBSD and Windows systems.
Feel free to create tickets for bugs and feature requests, and create pull requests if you have nice patches that you would like to share with others.
prompt_toolkit is cross platform, and everything that you build on top
should run fine on both Unix and Windows systems. On Windows, it uses a
different event loop (WaitForMultipleObjects instead of select), and
another input and output system. (Win32 APIs instead of pseudo-terminals and
VT100.)
It's worth noting that the implementation is a "best effort of what is possible". Both Unix and Windows terminals have their limitations. But in general, the Unix experience will still be a little better.
For Windows, it's recommended to use either cmder or conemu.
pip install prompt-toolkit
The most simple example of the library would look like this:
from prompt_toolkit import prompt
if __name__ == '__main__':
answer = prompt('Give me some input: ')
print('You said: %s' % answer)For more complex examples, have a look in the examples directory. All
examples are chosen to demonstrate only one thing. Also, don't be afraid to
look at the source code. The implementation of the prompt function could be
a good start.
Note: For Python 2, you need to add from __future__ import unicode_literals
to the above example. All strings are expected to be unicode strings.
- ptpython: Python REPL
- ptpdb: Python debugger (pdb replacement)
- pgcli: Postgres client.
- mycli: MySql client.
- pyvim: A Vim clone in pure Python
- wharfee: A Docker command line.
- xonsh: A Python-ish, BASHwards-compatible shell.
- saws: A Supercharged AWS Command Line Interface.
(Want your own project to be listed here? Please create a GitHub issue.)
The source code of prompt_toolkit should be readable, concise and
efficient. We prefer short functions focussing each on one task and for which
the input and output types are clearly specified. We mostly prefer composition
over inheritance, because inheritance can result in too much functionality in
the same object. We prefer immutable objects where possible (objects don't
change after initialisation). Reusability is important. We absolutely refrain
from having a changing global state, it should be possible to have multiple
independent instances of the same code in the same process. The architecture
should be layered: the lower levels operate on primitive operations and data
structures giving -- when correctly combined -- all the possible flexibility;
while at the higher level, there should be a simpler API, ready-to-use and
sufficient for most use cases. Thinking about algorithms and efficiency is
important, but avoid premature optimization.