Differences between revisions 10 and 16 (spanning 6 versions)
⇤ ← Revision 10 as of 2019-01-24 08:19:30 →
Size: 1779
Editor: SamatJain
Comment: Section on porting Python 2 → Python 3
← Revision 16 as of 2019-07-24 02:20:03 → ⇥
Size: 2933
Editor: SamatJain
Comment:
Deletions are marked like this. Additions are marked like this.
Line 2: Line 2:
<<TableOfContents>>
Line 11: Line 13:
python3-venv
Line 31: Line 34:
[[https://github.com/asottile/future-fstrings|asottile/future-fstrings]]. Allows formatted string literals (AKA f-strings) in Python 2.7–3.5 by hacking built-in codecs.

[[https://github.com/crsmithdev/arrow/|arrow]] (relatively mature) and [[https://github.com/zachwill/moment|moment]], a port of Moment.js, are date-handling libraries with a better API than Python's stdlib.
Line 35: Line 42:
== Typing ==

[[https://github.com/ambv/retype|ambv/retype]]: Re-applies type annotations from *.pyi stubs to a codebase.

For reference:

 * [[https://www.python.org/dev/peps/pep-0591/|PEP-591: Final and @final]]
 * [[https://www.python.org/dev/peps/pep-0589/|PEP-589: Typing for nested dictionaries]]
Line 37: Line 53:
=== Libraries === === Backports ===

==== subprocess ====

[[https://github.com/google/python-subprocess32|python-subprocess32]]: Backport of Python 3.2 `subprocess` module to 2.7. Use:

{{{#!highlight python numbers=off
if os.name == 'posix' and sys.version_info[0] < 3:
    import subprocess32 as subprocess
else:
    import subprocess
}}}

Can serve as a complete replacement for Python 2.7's `subprocess` module.

=== 2to3 libraries ===

Contents

  1. Development packages for Debian
  2. cffi and numpy
  3. Neat Web frameworks
  4. Neat packages
  5. Compilers
  6. Typing
  7. Porting projects from Python 2 to Python 3
    1. Backports
      1. subprocess
    2. 2to3 libraries
    3. Guides
    4. Notes

CodingStyle/Python is another relevant page.

Development packages for Debian

Current for Ubuntu 16.04. 

fabric
python-pip
python3-venv
python3-pip
python-wheel-common

cffi and numpy

https://github.com/SimonSapin/azureblur/tree/master/azureblur: Example of using cffi to interact w/ a C++ class.

python - How do I convert a numpy ND-array to a CFFI C++ array and back again? - Stack Overflow

python - Why is cffi so much quicker than numpy? - Stack Overflow

Neat Web frameworks

aspen.io. Filesystem-based dispatch library. Used by Liberapay.

Neat packages

nvbn/py-backwards: Python transcompiler. Lets you use Python 3.6 features in older versions, as old as Python 2.7.

asottile/future-fstrings. Allows formatted string literals (AKA f-strings) in Python 2.7–3.5 by hacking built-in codecs.

arrow (relatively mature) and moment, a port of Moment.js, are date-handling libraries with a better API than Python's stdlib.

Compilers

Nuitka: Python native-code compiler, binary will still link to libpython.

Typing

ambv/retype: Re-applies type annotations from *.pyi stubs to a codebase.

For reference:

Porting projects from Python 2 to Python 3

Backports

subprocess

python-subprocess32: Backport of Python 3.2 subprocess module to 2.7. Use: 

if os.name == 'posix' and sys.version_info[0] < 3:
    import subprocess32 as subprocess
else:
    import subprocess

Can serve as a complete replacement for Python 2.7's subprocess module.

2to3 libraries

Guides

Notes

SamatsWiki: ProgrammingLanguages/Python (last edited 2021-04-09 17:46:53 by SamatJain)