peng 1.0.8
This package provides engineering-related classes and functions, including:
License: MIT

.. README.rst
.. Copyright (c) 2013-2019 Pablo Acosta-Serafini
.. See LICENSE for details

.. image:: https://badge.fury.io/py/peng.svg
    :target: https://pypi.org/project/peng
    :alt: PyPI version

.. image:: https://img.shields.io/pypi/l/peng.svg
    :target: https://pypi.org/project/peng
    :alt: License

.. image:: https://img.shields.io/pypi/pyversions/peng.svg
    :target: https://pypi.org/project/peng
    :alt: Python versions supported

.. image:: https://img.shields.io/pypi/format/peng.svg
    :target: https://pypi.org/project/peng
    :alt: Format

|

.. image::
    https://dev.azure.com/pmasdev/peng/_apis/build/status/pmacosta.peng?branchName=master
    :target: https://dev.azure.com/pmasdev/peng/_build?definitionId=3&_a=summary
    :alt: Continuous integration test status

.. image::
    https://img.shields.io/azure-devops/coverage/pmasdev/peng/6.svg
    :target: https://dev.azure.com/pmasdev/peng/_build?definitionId=6&_a=summary
    :alt: Continuous integration test coverage

.. image::
    https://readthedocs.org/projects/pip/badge/?version=stable
    :target: https://pip.readthedocs.io/en/stable/?badge=stable
    :alt: Documentation status

|

Description
===========

.. role:: bash(code)
	:language: bash

.. [[[cog
.. import os, sys, pmisc, docs.support.requirements_to_rst
.. file_name = sys.modules['docs.support.requirements_to_rst'].__file__
.. mdir = os.path.join(os.path.realpath(
..    os.path.dirname(os.path.dirname(os.path.dirname(file_name)))), 'pypkg'
.. )
.. docs.support.requirements_to_rst.def_links(cog)
.. ]]]
.. _Astroid: https://bitbucket.org/logilab/astroid
.. _Cog: https://nedbatchelder.com/code/cog
.. _Coverage: https://coverage.readthedocs.io
.. _Decorator: https://decorator.readthedocs.io
.. _Docutils: http://docutils.sourceforge.net/docs
.. _Funcsigs: https://pypi.org/project/funcsigs
.. _Mock: https://docs.python.org/3/library/unittest.mock.html
.. _Numpy: http://www.numpy.org
.. _Pexdoc: http://pexdoc.readthedocs.org
.. _Pmisc: http://pmisc.readthedocs.org
.. _Pydocstyle: http://www.pydocstyle.org
.. _Pylint: https://www.pylint.org
.. _PyParsing: https://pyparsing.wikispaces.com
.. _Py.test: http://pytest.org
.. _Pytest-coverage: https://pypi.org/project/pytest-cov
.. _Pytest-pmisc: http://pytest-pmisc.readthedocs.org
.. _Pytest-xdist: https://pypi.org/project/pytest-xdist
.. _Scipy: https://www.scipy.org
.. _Six: https://pythonhosted.org/six
.. _Sphinx: http://sphinx-doc.org
.. _ReadTheDocs Sphinx theme: https://github.com/rtfd/sphinx_rtd_theme
.. _Inline Syntax Highlight Sphinx Extension:
   https://bitbucket.org/klorenz/sphinxcontrib-inlinesyntaxhighlight
.. _Shellcheck Linter Sphinx Extension:
   https://pypi.org/project/sphinxcontrib-shellcheck
.. _Tox: https://testrun.org/tox
.. _Virtualenv: https://docs.python-guide.org/dev/virtualenvs
.. [[[end]]]

This package provides engineering-related classes and functions, including:

* A waveform class that is a first-class object. For example:

    .. code-block:: python

        >>> import copy, numpy, peng
        >>> obj_a=peng.Waveform(
        ...     indep_vector=numpy.array([1, 2, 3]),
        ...     dep_vector=numpy.array([10, 20, 30]),
        ...     dep_name='obj_a'
        ... )
        >>> obj_b = obj_a*2
        >>> print(obj_b)
        Waveform: obj_a*2
        Independent variable: [ 1, 2, 3 ]
        Dependent variable: [ 20, 40, 60 ]
        Independent variable scale: LINEAR
        Dependent variable scale: LINEAR
        Independent variable units: (None)
        Dependent variable units: (None)
        Interpolating function: CONTINUOUS
        >>> obj_c = copy.copy(obj_b)
        >>> obj_a == obj_b
        False
        >>> obj_b == obj_c
        True

  Numerous functions are provided (trigonometric,
  calculus, transforms, etc.) and creating new functions that operate on
  waveforms is simple since all of their relevant information can be accessed
  through properties

* Handling numbers represented in engineering notation, obtaining
  their constituent components and converting to and from regular
  floats. For example:

    .. code-block:: python

        >>> import peng
        >>> x = peng.peng(1346, 2, True)
        >>> x
        '   1.35k'
        >>> peng.peng_float(x)
        1350.0
        >>> peng.peng_int(x)
        1
        >>> peng.peng_frac(x)
        35
        >>> str(peng.peng_mant(x))
        '1.35'
        >>> peng.peng_power(x)
        EngPower(suffix='k', exp=1000.0)
        >>> peng.peng_suffix(x)
        'k'

* Pretty printing Numpy vectors. For example:

    .. code-block:: python

        >>> from __future__ import print_function
        >>> import peng
        >>> header = 'Vector: '
        >>> data = [1e-3, 20e-6, 30e+6, 4e-12, 5.25e3, -6e-9, 70, 8, 9]
        >>> print(
        ...     header+peng.pprint_vector(
        ...         data,
        ...         width=30,
        ...         eng=True,
        ...         frac_length=1,
        ...         limit=True,
        ...         indent=len(header)
        ...     )
        ... )
        Vector: [    1.0m,   20.0u,   30.0M,
                             ...
                    70.0 ,    8.0 ,    9.0  ]

* Formatting numbers represented in scientific notation with a greater
  degree of control and options than standard Python string formatting.
  For example:

    .. code-block:: python

        >>> import peng
        >>> peng.to_scientific_string(
        ...     number=99.999,
        ...     frac_length=1,
        ...     exp_length=2,
        ...     sign_always=True
        ... )
        '+1.0E+02'

Interpreter
===========

The package has been developed and tested with Python 2.7, 3.5, 3.6 and 3.7
under Linux (Debian, Ubuntu), Apple macOS and Microsoft Windows

Installing
==========

.. code-block:: bash

	$ pip install peng

Documentation
=============

Available at `Read the Docs <https://peng.readthedocs.io>`_

Contributing
============

1. Abide by the adopted `code of conduct
   <https://www.contributor-covenant.org/version/1/4/code-of-conduct>`_

2. Fork the `repository <https://github.com/pmacosta/peng>`_ from
   GitHub and then clone personal copy [#f1]_:

    .. code-block:: bash

        $ github_user=myname
        $ git clone --recursive \
              https://github.com/"${github_user}"/peng.git
        Cloning into 'peng'...
        ...
        $ cd peng
        $ export PENG_DIR=${PWD}

3. Install the project's Git hooks and build the documentation. The pre-commit
   hook does some minor consistency checks, namely trailing whitespace and
   `PEP8 <https://www.python.org/dev/peps/pep-0008/>`_ compliance via
   Pylint. Assuming the directory to which the repository was cloned is
   in the :bash:`$PENG_DIR` shell environment variable:

	.. code-block:: bash

		$ "${PENG_DIR}"/pypkg/complete-cloning.sh
                Installing Git hooks
                Building peng package documentation
                ...

4. Ensure that the Python interpreter can find the package modules
   (update the :bash:`$PYTHONPATH` environment variable, or use
   `sys.paths() <https://docs.python.org/3/library/sys.html#sys.path>`_,
   etc.)

	.. code-block:: bash

		$ export PYTHONPATH=${PYTHONPATH}:${PENG_DIR}

5. Install the dependencies (if needed, done automatically by pip):

    .. [[[cog
    .. import docs.support.requirements_to_rst
    .. docs.support.requirements_to_rst.proc_requirements(cog)
    .. ]]]


    * `Astroid`_ (1.3.8 or newer)

    * `Cog`_ (2.4 or newer)

    * `Coverage`_ (3.7.1 or newer)

    * `Decorator`_ (3.4.2 or newer)

    * `Docutils`_ (0.12 or newer)

    * `Funcsigs`_ (Python 2.x only, 0.4 or newer)

    * `Inline Syntax Highlight Sphinx Extension`_ (0.2 or newer)

    * `Mock`_ (Python 2.x only, 1.0.1 or newer)

    * `Numpy`_ (1.8.2 or newer)

    * `Pexdoc`_ (1.1.1 or newer)

    * `Pmisc`_ (1.5.5 or newer)

    * `Py.test`_ (2.7.0 or newer)

    * `PyParsing`_ (2.0.7 or newer)

    * `Pydocstyle`_ (3.0.0 or newer)

    * `Pylint`_ (1.3.1 or newer)

    * `Pytest-coverage`_ (1.8.0 or newer except 2.3.0)

    * `Pytest-pmisc`_ (1.0.6 or newer)

    * `Pytest-xdist`_ (optional, 1.8.0 or newer)

    * `ReadTheDocs Sphinx theme`_ (0.1.9 or newer)

    * `Scipy`_ (0.13.3 or newer)

    * `Shellcheck Linter Sphinx Extension`_ (1.0.5 or newer)

    * `Six`_ (1.4.0 or newer)

    * `Sphinx`_ (1.5 or newer)

    * `Tox`_ (1.9.0 or newer)

    * `Virtualenv`_ (13.1.2 or newer)

    .. [[[end]]]

6. Implement a new feature or fix a bug

7. Write a unit test which shows that the contributed code works as expected.
   Run the package tests to ensure that the bug fix or new feature does not
   have adverse side effects. If possible achieve 100% code and branch
   coverage of the contribution. Thorough package validation
   can be done via Tox and Py.test:

	.. code-block:: bash

            $ tox
            GLOB sdist-make: .../peng/setup.py
            py26-pkg inst-nodeps: .../peng/.tox/dist/peng-...zip

   `Setuptools <https://bitbucket.org/pypa/setuptools>`_ can also be used
   (Tox is configured as its virtual environment manager):

	.. code-block:: bash

	    $ python setup.py tests
            running tests
            running egg_info
            writing requirements to peng.egg-info/requires.txt
            writing peng.egg-info/PKG-INFO
            ...

   Tox (or Setuptools via Tox) runs with the following default environments:
   ``py27-pkg``, ``py35-pkg``, ``py36-pkg`` and ``py37-pkg`` [#f3]_. These use
   the 2.7, 3.5, 3.6 and 3.7 interpreters, respectively, to test all code in the
   documentation (both in Sphinx ``*.rst`` source files and in docstrings), run
   all unit tests, measure test coverage and re-build the exceptions
   documentation. To pass arguments to Py.test (the test runner) use a double
   dash (``--``) after all the Tox arguments, for example:

	.. code-block:: bash

	    $ tox -e py27-pkg -- -n 4
            GLOB sdist-make: .../peng/setup.py
            py27-pkg inst-nodeps: .../peng/.tox/dist/peng-...zip
            ...

   Or use the :code:`-a` Setuptools optional argument followed by a quoted
   string with the arguments for Py.test. For example:

	.. code-block:: bash

	    $ python setup.py tests -a "-e py27-pkg -- -n 4"
            running tests
            ...

   There are other convenience environments defined for Tox [#f3]_:

    * ``py27-repl``, ``py35-repl``, ``py36-repl`` and ``py37-repl`` run the 2.7,
      3.5, 3.6 or 3.7 REPL, respectively, in the appropriate virtual
      environment. The ``peng`` package is pip-installed by Tox when the
      environments are created.  Arguments to the interpreter can be passed in
      the command line after a double dash (``--``)

    * ``py27-test``, ``py35-test``, ``py36-test`` and ``py37-test`` run py.test
      using the Python 2.7, 3.5, Python 3.6 or Python 3.7 interpreter,
      respectively, in the appropriate virtual environment. Arguments to py.test
      can be passed in the command line after a double dash (``--``) , for
      example:

	.. code-block:: bash

	    $ tox -e py36-test -- -x test_peng.py
            GLOB sdist-make: [...]/peng/setup.py
            py36-test inst-nodeps: [...]/peng/.tox/dist/peng-1.1rc1.zip
            py36-test installed: -f file:[...]
            py36-test runtests: PYTHONHASHSEED='1264622266'
            py36-test runtests: commands[0] | [...]py.test -x test_peng.py
            ===================== test session starts =====================
            platform linux -- Python 3.6.4, pytest-3.3.1, py-1.5.2, pluggy-0.6.0
            rootdir: [...]/peng/.tox/py36/share/peng/tests, inifile: pytest.ini
            plugins: xdist-1.21.0, forked-0.2, cov-2.5.1
            collected 414 items
            ...

    * ``py27-cov``, ``py35-cov``, ``py36-cov`` and ``py37-cov`` test code and
      branch coverage using the 2.7, 3.5, 3.6 or 3.7 interpreter, respectively,
      in the appropriate virtual environment. Arguments to py.test can be passed
      in the command line after a double dash (``--``). The report can be found
      in
      :bash:`${PENG_DIR}/.tox/py[PV]/usr/share/peng/tests/htmlcov/index.html`
      where ``[PV]`` stands for ``27``, ``35``, ``36`` or ``37`` depending on
      the interpreter used

8. Verify that continuous integration tests pass. The package has continuous
   integration configured for Linux, Apple macOS and Microsoft Windows (all via
   `Azure DevOps <https://dev.azure.com/pmasdev>`_) Aggregation/cloud code
   coverage is configured via `Codecov <https://codecov.io>`_. It is assumed
   that the Codecov repository upload token in the build is stored in the
   :bash:`$(codecovToken)` environment variable (securely defined in the
   pipeline settings page).

9. Document the new feature or bug fix (if needed). The script
   :bash:`${PENG_DIR}/pypkg/build_docs.py` re-builds the whole package
   documentation (re-generates images, cogs source files, etc.):

	.. [[[cog pmisc.ste('build_docs.py -h', 0, mdir, cog.out) ]]]

	.. code-block:: bash

	    $ ${PKG_BIN_DIR}/build_docs.py -h
	    usage: build_docs.py [-h] [-d DIRECTORY] [-r]
	                         [-n NUM_CPUS] [-t]

	    Build peng package documentation

	    optional arguments:
	      -h, --help            show this help message and exit
	      -d DIRECTORY, --directory DIRECTORY
	                            specify source file directory
	                            (default ../peng)
	      -r, --rebuild         rebuild exceptions documentation.
	                            If no module name is given all
	                            modules with auto-generated
	                            exceptions documentation are
	                            rebuilt
	      -n NUM_CPUS, --num-cpus NUM_CPUS
	                            number of CPUs to use (default: 1)
	      -t, --test            diff original and rebuilt file(s)
	                            (exit code 0 indicates file(s) are
	                            identical, exit code 1 indicates
	                            file(s) are different)

	.. [[[end]]]

.. rubric:: Footnotes

.. [#f1] All examples are for the `bash <https://www.gnu.org/software/bash/>`_
   shell

.. [#f2] It is assumed that all the Python interpreters are in the executables
   path. Source code for the interpreters can be downloaded from Python's main
   `site <https://www.python.org/downloads/>`_

.. [#f3] Tox configuration largely inspired by
   `Ionel's codelog <https://blog.ionelmc.ro/2015/04/14/
   tox-tricks-and-patterns/>`_


License
=======

The MIT License (MIT)

Copyright (c) 2013-2019 Pablo Acosta-Serafini

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
.. CHANGELOG.rst
.. Copyright (c) 2013-2019 Pablo Acosta-Serafini
.. See LICENSE for details

Changelog
=========

* 1.0.8 [2019-03-08]: Speedup loading of large Touchstone files (Patch submitted
  by github/sotw1957). Minor other code style changes.

* 1.0.7 [2019-03-08]: Dropped support for Python 2.6, 3.3 and 3.4. Updates
  to support newest versions of dependencies. Abstracted package management to
  a lightweight framework

* 1.0.6 [2016-02-11]: Package build enhancements and fixes

* 1.0.5 [2016-02-09]: Python 3.6 support

* 1.0.4 [2016-09-19]: Fixed Touchstone read function for "MA" and "DB" formats
  where the angles were incorrectly treated as being in radians

* 1.0.3 [2016-07-29]: Fixed resolution loss when writing Touchstone files

* 1.0.2 [2016-07-25]:

   * Frequency vector is now always in Hertz regardless of unit used in
     Touchstone file

   * Minor documentation bug fixes

* 1.0.1 [2016-06-11]: Minor documentation build bug fix

* 1.0.0 [2016-05-12]: Final release of 1.0.0 branch

* 1.0.0rc1 [2016-05-11]: Initial commit, forked a subset from putil PyPI
  package