taurus.core.tangoΒΆ

Tango extension for taurus core mode. The Tango extension implements taurus.core objects that connect to Tango objects. The official scheme name is, obviously, ‘tango’.

This extension maps the (Py)Tango objects into Taurus objects as follows:

You should never create objects from the above classes directly. Instead, you should use taurus.Authority(), taurus.Device(), and taurus.Attribute() helper functions, as in the examples below, or if you require more control, use the taurus.core.taurusmanager.TaurusManager or taurus.core.taurusfactory.TaurusFactory APIs.

Here are some examples:

The Taurus Authority associated with the Tango database running on host “machine01” and port 10000 is named “//machine:10000” (note that Taurus authority names are always prefixed by “//”, to comply with RFC3986). And you can get the corresponding Taurus Authority object as:

>>> import taurus
>>> my_db = taurus.Authority('tango://machine:10000')

If “tango” is configured as the default scheme for Taurus, the ‘tango:’ prefix could be avoided and same database could be accessed as:

>>> my_db = taurus.Authority('//machine:10000')

Now, assume that a TangoTest device is registered in the above database as sys/tg_test/1. In this case, the corresponding Taurus device full name would be tango://machine:10000/sys/tg_test/1 and it could be accessed as:

>>> import taurus
>>> my_device = taurus.Device('tango://machine:10000/sys/tg_test/1')

If “tango” is configured as the default scheme for Taurus, the previous name could be shortened to //machine:10000/sys/tg_test/1 or even to sys/tg_test/1 if the TANGO_HOST environment variable (or tango.rc file) point to machine:10000 as the default tango database. Furthermore, if, on top of that, this device is aliased as tgtest1 in the database, it could be accessed as:

>>> import taurus
>>> my_device = taurus.Device('tgtest1')

Similarly, accessing the ampli attribute from the above Tango device can be done using its full name:

>>> import taurus
>>> my_attr = taurus.Attribute('tango://machine:10000/sys/tg_test/1/ampli')

And of course shorter names can also be used for attributes. Following the examples for the device above, the following names could also have been passed to taurus.Attribute():

  • //machine:10000/sys/tg_test/1/ampli
  • sys/tg_test/1/ampli
  • tgtest1/ampli

Finally, the TangoFactory object can be accessed as:

>>> import taurus
>>> tg_factory = taurus.Factory('tango')

Note

Previous to TEP3, a RFC3986 non-compliant syntax was used for the Tango scheme (e.g., allowing names such as tango://a/b/c/d -note the double slash which should not be there). This syntax is now deprecated and should not be used. Taurus will issue warnings if detected.

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