Mercurial > repos > shellac > guppy_basecaller
diff env/lib/python3.7/site-packages/past/__init__.py @ 0:26e78fe6e8c4 draft
"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author | shellac |
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date | Sat, 02 May 2020 07:14:21 -0400 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/env/lib/python3.7/site-packages/past/__init__.py Sat May 02 07:14:21 2020 -0400 @@ -0,0 +1,90 @@ +# coding=utf-8 +""" +past: compatibility with Python 2 from Python 3 +=============================================== + +``past`` is a package to aid with Python 2/3 compatibility. Whereas ``future`` +contains backports of Python 3 constructs to Python 2, ``past`` provides +implementations of some Python 2 constructs in Python 3 and tools to import and +run Python 2 code in Python 3. It is intended to be used sparingly, as a way of +running old Python 2 code from Python 3 until the code is ported properly. + +Potential uses for libraries: + +- as a step in porting a Python 2 codebase to Python 3 (e.g. with the ``futurize`` script) +- to provide Python 3 support for previously Python 2-only libraries with the + same APIs as on Python 2 -- particularly with regard to 8-bit strings (the + ``past.builtins.str`` type). +- to aid in providing minimal-effort Python 3 support for applications using + libraries that do not yet wish to upgrade their code properly to Python 3, or + wish to upgrade it gradually to Python 3 style. + + +Here are some code examples that run identically on Python 3 and 2:: + + >>> from past.builtins import str as oldstr + + >>> philosopher = oldstr(u'\u5b54\u5b50'.encode('utf-8')) + >>> # This now behaves like a Py2 byte-string on both Py2 and Py3. + >>> # For example, indexing returns a Python 2-like string object, not + >>> # an integer: + >>> philosopher[0] + '\xe5' + >>> type(philosopher[0]) + <past.builtins.oldstr> + + >>> # List-producing versions of range, reduce, map, filter + >>> from past.builtins import range, reduce + >>> range(10) + [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] + >>> reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) + 15 + + >>> # Other functions removed in Python 3 are resurrected ... + >>> from past.builtins import execfile + >>> execfile('myfile.py') + + >>> from past.builtins import raw_input + >>> name = raw_input('What is your name? ') + What is your name? [cursor] + + >>> from past.builtins import reload + >>> reload(mymodule) # equivalent to imp.reload(mymodule) in Python 3 + + >>> from past.builtins import xrange + >>> for i in xrange(10): + ... pass + + +It also provides import hooks so you can import and use Python 2 modules like +this:: + + $ python3 + + >>> from past.translation import autotranslate + >>> authotranslate('mypy2module') + >>> import mypy2module + +until the authors of the Python 2 modules have upgraded their code. Then, for +example:: + + >>> mypy2module.func_taking_py2_string(oldstr(b'abcd')) + + +Credits +------- + +:Author: Ed Schofield, Jordan M. Adler, et al +:Sponsor: Python Charmers Pty Ltd, Australia: http://pythoncharmers.com + + +Licensing +--------- +Copyright 2013-2019 Python Charmers Pty Ltd, Australia. +The software is distributed under an MIT licence. See LICENSE.txt. +""" + +from future import __version__, __copyright__, __license__ + +__title__ = 'past' +__author__ = 'Ed Schofield'