Dflit

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- Flit can now build sdists (tarballs) and upload them to PyPI, if your code is
in a git or mercurial repository. There are new commands:

- ``flit build`` builds both a wheel and an sdist.
- ``flit publish`` builds and uploads a wheel and an sdist.

- Smarter ways of getting the information needed for upload:

- If you have the `keyring <https://github.com/jaraco/keyring>`_ package
installed, flit can use it to store your password, rather than keeping it
in plain text in ``~/.pypirc``.
- If ``~/.pypirc`` does not already exist, and you are prompted for your
username, flit will write it into that file.
- You can provide the information as environment variables:
:envvar:`FLIT_USERNAME`, :envvar:`FLIT_PASSWORD` and :envvar:`FLIT_INDEX_URL`.
Use this to upload packages from a CI service, for instance.

- Include 'LICENSE' or 'COPYING' files in wheels.
- Fix for ``flit install --symlink`` inside a virtualenv.

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- Downstream packagers can use the :envvar:`FLIT_NO_NETWORK` environment
variable to stop flit downloading data from the network.

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- ``flit install`` and ``flit installfrom`` now take an optional ``--python`` argument,
with the path to the Python executable you want to install it for.
Using this, you can install modules to Python 2.
- Installing a module normally (without ``--symlink``) builds a wheel and uses
pip to install it, which should work better in some corner cases.

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- A new ``flit installfrom`` subcommand to install a project from a source
archive, such as from Github.
- :doc:`Reproducible builds <reproducible>` - you can produce byte-for-byte
identical wheels.
- A warning for non-canonical version numbers according to `PEP 440
<https://www.python.org/dev/peps/pep-0440/>`__.
- Fix for installing projects on Windows.
- Better error message when module docstring is only whitespace.

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- A new ``dev-requires`` field in the config file for development requirements,
used when doing ``flit install``.
- Added a ``--deps`` option for ``flit install`` to control which dependencies
are installed.
- Flit can now be invoked with ``python -m flit``.

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- ``flit install`` now ensures requirements specified in ``flit.ini`` are
installed, using pip.
- If you specify a description file, flit now warns you if it's not valid
reStructuredText (since invalid reStructuredText is treated as plain text on
PyPI).
- Improved the error message for mis-spelled keys in ``flit.ini``.