Pytango write attributes

Now we will go into more detail and explain required background to understand the execution model.

Pytango write attributes

The decorators receive three optional arguments: All you have to do is write a PLCMirror. There are several ways to create dynamic attributes. One of the way, is to create all the devices within a loop, then to create the dynamic attributes and finally to make all the pytango write attributes available for the external world.

In Python device server, this method is generic and the user does not have one. There is another point to be noted regarding dynamic attribute within Python device server.

Using dynamic attribute, it is not possible to define these methods because attributes name and number are known only at run-time. The method passed here as argument as to be class method and not object method. Note, that depending on the number of argument you pass to this method, you may have to use Python keyword argument.

The necessary methods required by the Tango Python device server core will be created automatically as a forward to the methods given as arguments. When called, this command creates a new scalar floating point attribute with the specified name: There are two ways to create a new device which are described below.

Tango imposes a limitation: If you use the high level API, the tango class es must be listed in the call to run. No error processing was done on the code for simplicity sake: It can be used, for example, to initialize some device properties.

For example, if you wish to create a clone of your device, you can create a tango command called Clone: In the example it is given for demonstration purposes only. Create the Util object passing it the Python interpreter command line arguments Add to this object the list of Tango class es which have to be hosted by this interpreter Initialize the device server Run the device server loop The following is a typical code for this main function: If you are using an older version please use Util.

Host and manage data you have only once for the Tango class whatever devices of this class will be created Define Tango class command s Define Tango class attribute s In our example, the code of this Python class looks like: DevLong, "Number" ], [ tango.

DevVarStringArray, "Array of string" ], [ tango. The IOLong command is defined at lines 3 and 4. This dict has one element per command.

The element key is the command name. The element value is a python list which defines the command. The generic form of a command definition is: ArgType pseudo enumeration value and optionally a string describing this input argument.These structures are used by PyTango for attributes defined as “SPECTRUM”; in order to correctly save user’s data in JSON, I had to add a custom JSON encoder (see this commit for more information).

What I am starting to do now is perhaps the most significant part of my project, which is the implementation of user’s step estimation.

Tango at Hasylab

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pytango write attributes

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An attribute is identified by a name in a device. It has a value that can be read. Some attributes can also be changed (read-write attributes).

Each attribute has a well known, fixed data type. A pipe is a kind of attribute.


Unlike attributes, the pipe data type is strucured (in the sence of C struct) and it is dynamic. All Ubuntu Overview, Ubuntu Main Overview. You are looking at information on the Bazaar importer system that serves Ubuntu Distributed's hoped that you won't have to care about the existence of this, but things don't always work out that way.

Since PyTango 9 the build system used to compile PyTango is the standard python setuptools. Besides the binaries for the three dependencies mentioned above, you also need the development files for the respective libraries.

The method executed when the Long_attr attribute is read. Note that before PyTango 7 it sets the attribute value with the nationwidesecretarial.com_attribute_value function.

Now the same can be done using the set_value of the attribute object Line 61 to 62 The is_allowed method for the Long_attr attribute. This is an optional method that is called when the attribute is read or written.

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