eight 0.4.1

Installation

pip install eight

Synopsis

from eight import *
from eight import queue
from eight.collections import UserList, deque

If you use print, division, non-ASCII literals, or relative imports, you should also add this future import at the top of each source file:

from __future__ import (print_function, division, unicode_literals, absolute_import)

Wrapping stdio

Eight provides wrappers for sys.stdin, sys.stdout, and sys.stderr to make them (and methods that use them) behave like they do on Python 3. Specifically, in Python 3 these streams accept text data, and their .buffer attributes refer to the underlying streams that accept bytes. Eight uses the io module to do the same for you, but subclasses the TextIOWrapper class for sys.stdout and sys.stderr to coerce non-unicode input to unicode on Python 2 (otherwise, because of the Python 2 semantics, things like exception printing cease to work).

To enable stdio wrapping, use the following:

import eight
eight.wrap_stdio()

To revert the effects of this on any of the streams, use the detach method, e.g. sys.stdin = sys.stdin.detach() (but remember to condition this on eight.USING_PYTHON2). See the io module documentation for more information.

Decoding command-line arguments

Eight provides a utility function to decode the contents of sys.argv on Python 2 (as Python 3 does). It uses sys.stdin.encoding as the encoding to do so:

import eight
eight.decode_command_line_args()

The call to decode_command_line_args() replaces sys.argv with its decoded contents and returns the new contents. On Python 3, the call is a no-op (it returns sys.argv and leaves it intact).

Wrapping environment variable getters and setters

Eight provides utility wrappers to help bring Python 2 environment variable access and assignment in line with Python 3: encode the input to os.putenv (which is used for statements like os.environ[x] = y) and decode the output of os.getenv (used for x = os.environ[y]). Use wrap_os_environ_io() to monkey-patch these wrappers into the os module:

import eight
eight.wrap_os_environ_io()

On Python 3, the call is a no-op.

Selecting from the buffet

You can see what from eight import * will do by running IPython and typing import eight, then eight.<TAB>. Here is a full list of what’s available:

• ascii

• bytes

• chr

• filter

• hex

• input

• int

• map

• oct

• open

• range

• round

• str

• super

• zip

You can import these symbols by listing them explicitly. If for any reason you see an issue with importing them all (which is recommended), you can of course import a subset.

In addition to names imported by from eight import *, the following modules are available and should be imported by name using from eight import <name> when needed:

• queue (old name: Queue)

• builtins (old name: __builtin__)

• copyreg (old name: copy_reg)

• configparser (old name: ConfigParser)

• reprlib (old name: repr)

• winreg (old name: _winreg)

• _thread (old name: thread)

• _dummy_thread (old name: dummy_thread)

The following modules have attributes which resided elsewhere in Python 2: TODO

Acknowledgments

Python-future for doing a bunch of heavy lifting on backports of Python 3 features.

Links

• Project home page (GitHub)

• Documentation (Read the Docs)

• Package distribution (PyPI)

License

Licensed under the terms of the Apache License, Version 2.0.