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yarl
====
:align: right
:alt: Chat on Gitter
Introduction
------------
Url is constructed from ``str``:
.. code-block:: pycon
>>> from yarl import URL
>>> url
All url parts: *scheme*, *user*, *password*, *host*, *port*, *path*,
*query* and *fragment* are accessible by properties:
.. code-block:: pycon
>>> url.scheme
'https'
>>> url.host
'www.python.org'
>>> url.path
'/~guido'
>>> url.query_string
'arg=1'
>>> url.query
<MultiDictProxy('arg': '1')>
>>> url.fragment
'frag'
All url manipulations produce a new url object:
.. code-block:: pycon
>>> url / 'foo' / 'bar'
>>> url / 'foo' % {'bar': 'baz'}
Strings passed to constructor and modification methods are
automatically encoded giving canonical representation as result:
.. code-block:: pycon
>>> url
Regular properties are *percent-decoded*, use ``raw_`` versions for
getting *encoded* strings:
.. code-block:: pycon
>>> url.path
'/путь'
>>> url.raw_path
'/%D0%BF%D1%83%D1%82%D1%8C'
Human readable representation of URL is available as ``.human_repr()``:
.. code-block:: pycon
>>> url.human_repr()
Installation
------------
::
$ pip install yarl
The library is Python 3 only!
PyPI contains binary wheels for Linux, Windows and MacOS. If you want to install
``yarl`` on another operating system (like *Alpine Linux*, which is not
manylinux-compliant because of the missing glibc and therefore, cannot be
used with our wheels) the the tarball will be used to compile the library from
the source code. It requires a C compiler and and Python headers installed.
To skip the compilation you must explicitly opt-in by setting the `YARL_NO_EXTENSIONS`
environment variable to a non-empty value, e.g.:
.. code-block:: bash
$ YARL_NO_EXTENSIONS=1 pip install yarl
Please note that the pure-Python (uncompiled) version is much slower. However,
PyPy always uses a pure-Python implementation, and, as such, it is unaffected
by this variable.
Dependencies
------------
YARL requires multidict_ library.
API documentation
------------------
Why isn't boolean supported by the URL query API?
-------------------------------------------------
There is no standard for boolean representation of boolean values.
Some systems prefer ``true``/``false``, others like ``yes``/``no``, ``on``/``off``,
``Y``/``N``, ``1``/``0``, etc.
``yarl`` cannot make an unambiguous decision on how to serialize ``bool`` values because
it is specific to how the end-user's application is built and would be different for
different apps. The library doesn't accept booleans in the API; a user should convert
bools into strings using own preferred translation protocol.
Comparison with other URL libraries
------------------------------------
The library has rich functionality but the ``furl`` object is mutable.
I'm afraid to pass this object into foreign code: who knows if the
code will modify my url in a terrible way while I just want to send URL
with handy helpers for accessing URL properties.
``furl`` has other non-obvious tricky things but the main objection
is mutability.
URLObject is immutable, that's pretty good.
Every URL change generates a new URL object.
But the library doesn't do any decode/encode transformations leaving the
end user to cope with these gory details.
Source code
-----------
The project is hosted on GitHub_
Please file an issue on the `bug tracker
or have some suggestion in order to improve the library.
Continuous Integration.
Discussion list
---------------
Feel free to post your questions and ideas here.
Authors and License
-------------------
The ``yarl`` package is written by Andrew Svetlov.
It's *Apache 2* licensed and freely available.