Cross-platform colored terminal text.
Project description
http://code.google.com/p/colorama/
Description
Makes ANSI escape character sequences for producing colored terminal text work under MS Windows.
ANSI escape character sequences have long been used to produce colored terminal text on Unix and Macs. Colorama makes this work on Windows, too. It also provides some shortcuts to help generate ANSI sequences, and works fine in conjunction with any other ANSI sequence generation library, such as Termcolor (http://pypi.python.org/pypi/termcolor.)
This has the upshot of providing a simple cross-platform API for printing colored terminal text from Python, and has the happy side-effect that existing applications or libraries which use ANSI sequences to produce colored output on Linux or Macs can now also work on Windows, simply by calling colorama.init().
Dependencies
None, other than Python. Tested on Python 2.6.5.
Usage
Initialisation
Applications should initialise Colorama using:
from colorama import init init()
If you are on Windows, the call to ‘’init()’’ will start filtering ANSI escape sequences out of any text sent to stdout or stderr, and will replace them with equivalent Win32 calls.
Calling ‘’init()’’ has no effect on other platforms (unless you use ‘autoreset’, see below) The intention is that applications should call init() unconditionally to make subsequent ANSI output just work on all platforms.
Colored Output
Cross-platform printing of colored text can then be done using Colorama’s constant shorthand for ANSI escape sequences:
from colorama import Fore, Back, Style print Fore.RED + 'some red text' print Back.GREEN + and with a green background' print Style.DIM + 'and in dim text' print + Fore.DEFAULT + Back.DEFAULT + Style.DEFAULT print 'back to normal now'
or simply by manually printing ANSI sequences from your own code:
print '/033[31m' + 'some red text' print '/033[30m' # and reset to default color
or Colorama can be used happily in conjunction with existing ANSI libraries such as Termcolor:
# use Colorama to make Termcolor work on Windows too
from colorama import init
init()
# then use Termcolor for all colored text output
from termcolor import colored
print colored('Hello, World!', 'green', 'on_red')
Available formatting constants are:
Fore: BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, DEFAULT. Back: BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, DEFAULT. Style: DIM, NORMAL, BRIGHT, RESET_ALL
Style.RESET_ALL resets foreground, background and brightness. Colorama will perform this reset automatically on program exit.
Autoreset
If you find yourself repeatedly sending reset sequences to turn off color changes at the end of every print, then init(autoreset=True) will automate that:
from colorama import init init(autoreset=True) print Fore.RED + 'some red text' print 'automatically back to default color again'
Without wrapping stdout
Colorama works by wrapping stdout and stderr with proxy objects, that override write() to do their work. Using autoreset (above) will do this wrapping on all platforms, not just Windows.
If these proxy objects wrapping stdout and stderr cause you problems, then this can be disabled using init(wrap=False). You can then access Colorama’s AnsiToWin32 proxy directly. Any attribute access on this object will be forwarded to the stream it wraps, apart from .write(), which on Windows is overridden to first perform the ANSI to Win32 conversion on text:
from colorama import init, AnsiToWin32 init(wrap=False) stream = AnsiToWin32(sys.stderr) print >>stream, Fore.BLUE + 'blue text on stderr'
Status & Known Problems
Just became feature complete. Alpha release.
Only tested on WinXP (CMD, Console2) and Ubuntu (gnome-terminal, xterm). Much obliged if anyone can let me know how it fares elsewhere, in particular on Macs.
Detailed behaviour differs between operating systems:
On Linux terminals, scrolling fills the whole new line with the current background color. On windows, the new line is filled with the default background color.
On Linux terminals, the ‘RESET’ background and foreground colors are potentially distinct from all other colors. On Windows, Back.RESET and Fore.RESET produce an RGB which is indistinguishable from one of the other color entries.
Only the colors and dim/bright subset of ANSI ‘m’ commands are recognised. There are many other ANSI sequences (eg. moving cursor position) that could also be usefully converted into win32 calls. These are currently silently stripped from the output on Windows.
Development
Tests require Michael Foord’s modules ‘unittest2’ and ‘mock’, running tests using:
unit2 discover -p '*_test.py'
Changes
- 0.1.5
Now works on Ubuntu.
- 0.1.4
Implemented RESET_ALL on application exit
- 0.1.3
Implemented init(wrap=False)
- 0.1.2
Implemented init(autoreset=True)
- 0.1.1
Minor tidy
- 0.1
Works on Windows for foreground color, background color, bright or dim
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