.. py:module:: fair

Fair stands
===========

Every year, a city council holds a summer solstice fair, with several
stands. The city council has a file where each line contains the name
of the stand (:class:`str`), its length (:class:`float`) and the
product it offers (:class:`str`), separated by a semicolon
(``';'``). In addition, there is a dictionary (:class:`dict`) where
the key is the name of a product and the value is its type (both
:class:`str`). There are only two types of products: *food* and
*handicrafts*. In the file, the stands are sorted in desdending order
of preference to participate in the fair (which depends on several
factors). Next, there is an example of such a file:

     .. literalinclude:: examples/stands.txt
        :language: text
        :lines: 1-

You can download this example file:
:download:`stands.txt<examples/stands.txt>`

This year, the city council wants to put food stands on one side of
the main street and handicraft stands on the other side. Each side of
the main street has a length that cannot be exceeded. The city council
asks us to create two files: one with the names of the selected food
stands and the other one with the names of the selected handicraft
stands. The stands are assigned in the same order of appearance in the given
file and are taken until they fill the corresponding side of the main
street. If there is a stand that does not fit, but there is another of
lesser preference that fits, this last stand must be assigned.

Save all functions into the same file named ``fair.py``.

1. Write function :py:func:`decode` that takes a line of the given
   file (:class:`str`) and the given dictionary, and returns a
   (:class:`tuple`) with the name (:class:`str`), lenght
   (:class:`float`) and product type (:class:`str`) of the
   stand. Examples:

   .. literalinclude:: test-decode.txt
      :language: python3
      :lines: 3-

   .. note::

      More tests are provided in file :download:`test-decode.txt`.

2. Write function :py:func:`stands` that takes the names
   (:class:`str`) of three files (*fstands*, *ffood* and *fcrafts*), a
   dictionary as the one described and the lengths (:class:`float`) of
   the sides of the main street (*lfood*, *lcraft*). File with name
   *fstands* is a file as that described. File with name *ffood* must
   contain the names of food type stands, a name at each line, and
   file with name *fcrafts* must contain the names of hadicrafts type
   stands, also a name at each line, following the mentioned
   rules. This function must call the previous one. For the following
   example:

   .. literalinclude:: test-stands.txt
      :language: python3
      :lines: 14-18


   this function must create two files with the names ``'food.txt'`` and ``'craft.txt'``, with the following content::

	  'food.txt'        	              'craft.txt'

	  joan pera         	              marta perez   
	  pepeta morales    	              georgina pi
	                    	              jordi pons


   .. note::

      Automatic tests are provided in file :download:`test-stands.txt`.

.. rubric:: Solution

A solution is provided in file :download:`fair.py<solution/fair.py>`.