Fandango (Fun for Tango)

NOTE:  Fandango package is a refactored version of the old PyTango_utils package, which is now deprecated

Contact with the author

Downloading

Fandango can be downloaded from sourceforge:

svn co https://tango-cs.svn.sourceforge.net/svnroot/tango-cs/share/fandango/trunk/fandango fandango

Requirements

• It requires PyTango to access Tango
• It requires Taurus to use Tango Events.
• Some submodules have its own dependencies (Qt,MySQL), so they are always imported within try,except clauses.

Features

This library provides submodules with utilities for PyTango device servers and applications written in python:

• functional: functional programming, data format conversions, caseless regular expressions
• tango: tango api helper methods, search/modify using regular expressions
• dynamic: dynamic attributes, online python code evaluation
• server: Astor-like python API
• device: some templates for Tango device servers, TangoEval for fast "tango code" evaluation.
• interface: device server inheritance
• db: MySQL access
• dicts,arrays: advanced containers, sorted/caseless list/dictionaries, .csv parsing
• log: logging
• objects: object templates, singletones, structs
• threads: serialized hardware access, multiprocessing
• linos: some linux tricks
• web: html parsing
• qt: some custom Qt classes, including worker-like threads.
• ...

What it is used for

Several PyTango APIs and device servers use Fandango modules:

• PyTangoArchiving
• PyPLC
• !SplitterBoxDS
• PyStateComposer
• PySignalSimulator
• PyAlarm
• !CSVReader
• ...

Recipes for fandango modules usage

dynamic.DynamicDS: template for Dynamic Attributes

see [  http://www.tango-controls.org/howtos/dynamicattributes ]

servers.ServersDict: the Astor-like python API

start/stop all device servers in a machine (like Astor -> Stop All)

Stopping

import fandango
fandango.Astor(hosts=['my.host']).stop_all_servers()

and the other way round ...

astor = fandango.Astor(hosts=['my.host'])
astor.start_all_servers()

if you just want to see if things are effectively running or not:

astor.states()

Search for device attribute/properties matching a regular expression

fandango.tango.get_matching_device_properties('s01/*/*ct*','serial*')
{'S01/VC/IPCT-01': {'SerialLine': 'S01/VC/SERIAL-01'},
 'S01/VC/IPCT-02': {'SerialLine': 'S01/VC/SERIAL-02'},
 'S01/VC/VGCT-01': {'SerialLine': 'S01/VC/SERIAL-10'}} 

Use TangoEval to evaluate strings containing Tango Attributes

TangoEval evaluates tango code replacing attribute names by its values

from fandango import TangoEval
te = TangoEval('(s01/vc/gauge-01/pressure + s01/vc/gauge-01/pressure) / 2.')

[Out]: TangoEval: result = 7.2e-10