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annotate env/lib/python3.7/site-packages/past/__init__.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
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1 # coding=utf-8
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2 """
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3 past: compatibility with Python 2 from Python 3
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4 ===============================================
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5
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6 ``past`` is a package to aid with Python 2/3 compatibility. Whereas ``future``
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7 contains backports of Python 3 constructs to Python 2, ``past`` provides
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8 implementations of some Python 2 constructs in Python 3 and tools to import and
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9 run Python 2 code in Python 3. It is intended to be used sparingly, as a way of
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10 running old Python 2 code from Python 3 until the code is ported properly.
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11
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12 Potential uses for libraries:
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13
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14 - as a step in porting a Python 2 codebase to Python 3 (e.g. with the ``futurize`` script)
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15 - to provide Python 3 support for previously Python 2-only libraries with the
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16 same APIs as on Python 2 -- particularly with regard to 8-bit strings (the
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17 ``past.builtins.str`` type).
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18 - to aid in providing minimal-effort Python 3 support for applications using
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19 libraries that do not yet wish to upgrade their code properly to Python 3, or
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20 wish to upgrade it gradually to Python 3 style.
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21
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22
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23 Here are some code examples that run identically on Python 3 and 2::
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24
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25 >>> from past.builtins import str as oldstr
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26
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27 >>> philosopher = oldstr(u'\u5b54\u5b50'.encode('utf-8'))
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28 >>> # This now behaves like a Py2 byte-string on both Py2 and Py3.
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29 >>> # For example, indexing returns a Python 2-like string object, not
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30 >>> # an integer:
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31 >>> philosopher[0]
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32 '\xe5'
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33 >>> type(philosopher[0])
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34 <past.builtins.oldstr>
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35
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36 >>> # List-producing versions of range, reduce, map, filter
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37 >>> from past.builtins import range, reduce
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38 >>> range(10)
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39 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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40 >>> reduce(lambda x, y: x+y, [1, 2, 3, 4, 5])
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41 15
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42
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43 >>> # Other functions removed in Python 3 are resurrected ...
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44 >>> from past.builtins import execfile
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45 >>> execfile('myfile.py')
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46
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47 >>> from past.builtins import raw_input
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48 >>> name = raw_input('What is your name? ')
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49 What is your name? [cursor]
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50
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51 >>> from past.builtins import reload
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52 >>> reload(mymodule) # equivalent to imp.reload(mymodule) in Python 3
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53
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54 >>> from past.builtins import xrange
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55 >>> for i in xrange(10):
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56 ... pass
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57
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58
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59 It also provides import hooks so you can import and use Python 2 modules like
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60 this::
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61
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62 $ python3
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63
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64 >>> from past.translation import autotranslate
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65 >>> authotranslate('mypy2module')
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66 >>> import mypy2module
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67
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68 until the authors of the Python 2 modules have upgraded their code. Then, for
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69 example::
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70
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71 >>> mypy2module.func_taking_py2_string(oldstr(b'abcd'))
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72
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73
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74 Credits
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75 -------
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76
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77 :Author: Ed Schofield, Jordan M. Adler, et al
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78 :Sponsor: Python Charmers Pty Ltd, Australia: http://pythoncharmers.com
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79
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80
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81 Licensing
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82 ---------
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83 Copyright 2013-2019 Python Charmers Pty Ltd, Australia.
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84 The software is distributed under an MIT licence. See LICENSE.txt.
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85 """
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86
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87 from future import __version__, __copyright__, __license__
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88
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89 __title__ = 'past'
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90 __author__ = 'Ed Schofield'