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## page was renamed from Python
<<TableOfContents>>

[[CodingStyle/Python]] is another relevant page. Also:

<<FullSearchCached(t:ProgrammingLanguages/Python)>>

<<Navigation(children)>>
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python3-venv
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python-wheel
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== Neat Web frameworks ==

[[http://aspen.io|aspen.io]]. Filesystem-based dispatch library. Used by Liberapay.

== Neat packages ==

[[https://github.com/nvbn/py-backwards|nvbn/py-backwards]]: Python transcompiler. Lets you use Python 3.6 features in older versions, as old as Python 2.7.

[[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.

=== JSON ===

Parsing JSON without pulling your hair out…

[[https://pypi.org/project/glom/|glom]]

[[https://pypi.org/project/dpath/|dpath]]

[[https://pypi.org/project/jq/|jq]]

[[https://pypi.org/project/jmespath/|jmespath]]: used by awscli

[[https://pypi.org/project/jsons/|jsons]]: Serialize from and to Python objects, works with dataclasses and typed Python.

[[https://github.com/bogdandm/json2python-models|json2python-models]]: Create dataclasses automatically from JSON files

== Compilers ==

[[http://nuitka.net/|Nuitka]]: Python native-code compiler, binary will still link to libpython.

== 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]]

== Porting projects from Python 2 to Python 3 ==

=== 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 ===

 * [[http://python-future.org/|python-future]]
 * [[https://pythonhosted.org/six/|six]], along with [[https://python-modernize.readthedocs.io/|python-modernize]]

=== Guides ===

 * [[https://portingguide.readthedocs.io/en/latest/index.html|The Conservative Python 3 Porting Guide]]
 * [[https://docs.python.org/3/howto/pyporting.html|Porting Python 2 Code to Python 3]]

=== Notes ===

 * [[https://docs.python.org/3/howto/sorting.html#the-old-way-using-the-cmp-parameter|Sorting and using Python 3.2's funcutils.cmp_to_key()]]

== Packaging ==

=== requirements.txt ===

{{{
PyYAML ~= 5.3 # means >= V.N, == V.*
}}}

For more information, see:

 * [[https://pip.pypa.io/en/stable/reference/pip_install/#example-requirements-file|pip documentation: Example requirements file]]
 * [[https://www.python.org/dev/peps/pep-0440/#compatible-release|PEP 440: Version Identification and Dependency Specification: Compatible release]]

Contents

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

CodingStyle/Python is another relevant page. Also:

  1. ProgrammingLanguages/Python
  2. ProgrammingLanguages/Python/NumPy
  3. ProgrammingLanguages/Python/asyncio

/NumPy   /asyncio  

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.

JSON

Parsing JSON without pulling your hair out…

glom

dpath

jq

jmespath: used by awscli

jsons: Serialize from and to Python objects, works with dataclasses and typed Python.

json2python-models: Create dataclasses automatically from JSON files

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

Packaging

requirements.txt

PyYAML ~= 5.3  # means >= V.N, == V.*

For more information, see:

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