reprit 0.0.1

Auto __repr__ method generation.

reprit

In what follows

• python is an alias for python3.5 or any later version (python3.6 and so on),
• pypy is an alias for pypy3.5 or any later version (pypy3.6 and so on).

Installation

Install the latest pip & setuptools packages versions:

• with CPython

  python -m pip install --upgrade pip setuptools
  

• with PyPy

  pypy -m pip install --upgrade pip setuptools
  

User

Download and install the latest stable version from PyPI repository:

• with CPython

  python -m pip install --upgrade reprit
  

• with PyPy

  pypy -m pip install --upgrade reprit
  

Developer

Download the latest version from GitHub repository

git clone https://github.com/lycantropos/reprit.git
cd reprit

Install:

• with CPython

  python setup.py install
  

• with PyPy

  pypy setup.py install
  

Usage

Let's suppose we are defining a class and we want to have __repr__, that:

1. Includes parameters involved in instance creation. For simple cases it should be possible to copy string & paste in some place (e.g. REPL session) and have similar object definition with as less work as possible. This helps a lot during debugging sessions, logging, in failed test cases with randomly generated data, etc.
2. In case of signature change, method should handle this automatically for simple cases like renaming/removing/changing order of parameters.

This can be done like

from reprit.base import generate_repr


class DummyContainer:
    def __init__(self, positional, *variadic_positional, keyword_only, **variadic_keyword):
        self.positional = positional
        self.variadic_positional = variadic_positional
        self.keyword_only = keyword_only
        self.variadic_keyword = variadic_keyword

    __repr__ = generate_repr(__init__)

after that

>>> DummyContainer(range(10), 2, 3, keyword_only='some', a={'sample': 42}, b={1, 2})
DummyContainer(range(0, 10), 2, 3, keyword_only='some', a={'sample': 42}, b={1, 2})

or for a class with avoidance of built-in names clash & private attributes & both

from reprit import seekers
from reprit.base import generate_repr


class State:
    def __init__(self, id_, name, zip_):
        self.id = id_
        self._name = name
        self._zip = zip_

    __repr__ = generate_repr(__init__,
                             field_seeker=seekers.complex_)

after that

>>> State(1, 'Alabama', 36016)
State(1, 'Alabama', 36016)

Note: this method doesn't automatically handle changes during runtime (e.g. if someone deletes instance field or replaces __init__/__new__ method implementation), in this case user should update __repr__ method as well.

Development

Bumping version

Preparation

Install bump2version.

Pre-release

Choose which version number category to bump following semver specification.

Test bumping version

bump2version --dry-run --verbose $CATEGORY

where $CATEGORY is the target version number category name, possible values are patch/minor/major.

Bump version

bump2version --verbose $CATEGORY

This will set version to major.minor.patch-alpha.

Release

Test bumping version

bump2version --dry-run --verbose --tag release

Bump version

bump2version --verbose --tag release

This will set version to major.minor.patch and add Git tag.

Notes

To avoid inconsistency between branches and pull requests, bumping version should be merged into master branch as separate pull request.

Running tests

Plain:

• with CPython

  python setup.py test
  

• with PyPy

  pypy setup.py test
  

Inside Docker container:

• with CPython

  docker-compose --file docker-compose.cpython.yml up
  

• with PyPy

  docker-compose --file docker-compose.pypy.yml up
  

Bash script (e.g. can be used in Git hooks):

• with CPython

  ./run-tests.sh
  

  or

  ./run-tests.sh cpython
  

• with PyPy

  ./run-tests.sh pypy
  

PowerShell script (e.g. can be used in Git hooks):

• with CPython

  .\run-tests.ps1
  

  or

  .\run-tests.ps1 cpython
  

• with PyPy

  .\run-tests.ps1 pypy