add (self, subgroup, timeout_ms=-1) -> None
Attaches a (sub)_RealGroup.
To remove the subgroup use the remove() method.
Parameters:
subgroup: (str) timeout_ms: (int) If timeout_ms parameter is different from -1, the client side timeout associated to each device composing the _RealGroup added is set to timeout_ms milliseconds. If timeout_ms is -1, timeouts are not changed. Return: None
Throws: TypeError, ArgumentError
add(self, patterns, timeout_ms=-1) -> None
Attaches any device which name matches one of the specified patterns.
This method first asks to the Tango database the list of device names matching one the patterns. Devices are then attached to the group in the order in which they are returned by the database.
Any device already present in the hierarchy (i.e. a device belonging to the group or to one of its subgroups), is silently ignored but its client side timeout is set to timeout_ms milliseconds if timeout_ms is different from -1.
Parameters:
patterns: (str | sequence<str>) can be a simple device name or a device name pattern (e.g. domain_*/ family/member_*), or a sequence of these. timeout_ms: (int) If timeout_ms is different from -1, the client side timeouts of all devices matching the specified patterns are set to timeout_ms milliseconds. Return: None
Throws: TypeError, ArgumentError
command_inout ( self, cmd_name, param=None, forward=True) -> sequence<GroupCmdReply>
- Just a shortcut to do:
- self.command_inout_reply(self.command_inout_asynch(...))
Parameters:
cmd_name: (str) param: (any) forward: (bool) Return: (sequence<GroupCmdReply>)
command_inout_asynch (self, cmd_name, forget=False, forward=True, reserved=-1 ) -> int
command_inout_asynch (self, cmd_name, param=None forget=False, forward=True, reserved=-1 ) -> int
Executes a Tango command on each device in the group asynchronously. The method sends the request to all devices and returns immediately. Pass the returned request id to Group.command_inout_reply() to obtain the results.
Parameters:
cmd_name: (str) Command name param: (any) forget: (bool) Fire and forget flag. If set to true, it means that no reply is expected (i.e. the caller does not care about it and will not even try to get it) forward: (bool) If it is set to true (the default) request is forwarded to subgroups. Otherwise, it is only applied to the local set of devices. reserved: (int) is reserved for internal purpose and should not be used. This parameter may disappear in a near future. Return: (int) request id. Pass the returned request id to Group.command_inout_reply() to obtain the results.
Throws:
command_inout_reply (self, req_id, timeout_ms=0) -> sequence<GroupCmdReply>
Returns the results of an asynchronous command.
Parameters:
req_id: (int) Is a request identifier previously returned by one of the command_inout_asynch methods timeout_ms: (int) For each device in the hierarchy, if the command result is not yet available, command_inout_reply wait timeout_ms milliseconds before throwing an exception. This exception will be part of the global reply. If timeout_ms is set to 0, command_inout_reply waits “indefinitely”. Return: (sequence<GroupCmdReply>)
Throws:
contains (self, pattern, forward=True) -> bool
Parameters:
pattern: (str) The pattern can be a fully qualified or simple group name, a device name or a device name pattern. forward: (bool) If fwd is set to true (the default), the remove request is also forwarded to subgroups. Otherwise, it is only applied to the local set of elements. Return: (bool) Returns true if the hierarchy contains groups and/or devices which name matches the specified pattern. Returns false otherwise.
Throws:
get_device (self, dev_name) -> DeviceProxy
get_device (self, idx) -> DeviceProxy
Returns a reference to the specified device or None if there is no device by that name in the group. Or, returns a reference to the “idx-th” device in the hierarchy or NULL if the hierarchy contains less than “idx” devices.
This method may throw an exception in case the specified device belongs to the group but can’t be reached (not registered, down...). See example below:
try: dp = g.get_device("my/device/01") if dp is None: # my/device/01 does not belong to the group pass except DevFailed, f: # my/device/01 belongs to the group but can't be reached passThe request is systematically forwarded to subgroups (i.e. if no device named device_name could be found in the local set of devices, the request is forwarded to subgroups).
Parameters:
dev_name: (str) Device name. idx: (int) Device number. Return: (DeviceProxy) Be aware that this method returns a different DeviceProxy referring to the same device each time. So, do not use it directly for permanent things.
Example: # WRONG: The DeviceProxy will quickly go out of scope # and disappear (thus, the event will be automatically # unsubscribed) g.get_device("my/device/01").subscribe_events('attr', callback) # GOOD: dp = g.get_device("my/device/01") dp.subscribe_events('attr', callback)Throws:
get_device_list (self, forward=True) -> sequence<str>
Considering the following hierarchy:
g2.add("my/device/04") g2.add("my/device/05") g4.add("my/device/08") g4.add("my/device/09") g3.add("my/device/06") g3.add(g4) g3.add("my/device/07") g1.add("my/device/01") g1.add(g2) g1.add("my/device/03") g1.add(g3) g1.add("my/device/02")The returned vector content depends on the value of the forward option. If set to true, the results will be organized as follows:
dl = g1.get_device_list(True) dl[0] contains "my/device/01" which belongs to g1 dl[1] contains "my/device/04" which belongs to g1.g2 dl[2] contains "my/device/05" which belongs to g1.g2 dl[3] contains "my/device/03" which belongs to g1 dl[4] contains "my/device/06" which belongs to g1.g3 dl[5] contains "my/device/08" which belongs to g1.g3.g4 dl[6] contains "my/device/09" which belongs to g1.g3.g4 dl[7] contains "my/device/07" which belongs to g1.g3 dl[8] contains "my/device/02" which belongs to g1If the forward option is set to false, the results are:
dl = g1.get_device_list(False); dl[0] contains "my/device/01" which belongs to g1 dl[1] contains "my/device/03" which belongs to g1 dl[2] contains "my/device/02" which belongs to g1
Parameters:
forward: (bool) If it is set to true (the default), the request is forwarded to sub-groups. Otherwise, it is only applied to the local set of devices. Return: (sequence<str>) The list of devices currently in the hierarchy.
Throws:
get_group (self, group_name ) -> Group
Returns a reference to the specified group or None if there is no group by that name. The group_name can be a fully qualified name.
Considering the following group:
-> gauges |-> cell-01 | |-> penning | | |-> ... | |-> pirani | |-> ... |-> cell-02 | |-> penning | | |-> ... | |-> pirani | |-> ... | -> cell-03 | |-> ... | | -> ...A call to gauges.get_group(“penning”) returns the first group named “penning” in the hierarchy (i.e. gauges.cell-01.penning) while gauges.get_group(“gauges.cell-02.penning’‘) returns the specified group.
The request is systematically forwarded to subgroups (i.e. if no group named group_name could be found in the local set of elements, the request is forwarded to subgroups).
Parameters:
group_name: (str) Return: (Group)
Throws: New in PyTango 7.0.0
get_size (self, forward=True) -> int
Parameters:
forward: (bool) If it is set to true (the default), the request is forwarded to sub-groups. Return: (int) The number of the devices in the hierarchy
Throws:
ping (self, forward=True) -> bool
Ping all devices in a group.
Parameters:
forward: (bool) If fwd is set to true (the default), the request is also forwarded to subgroups. Otherwise, it is only applied to the local set of devices. Return: (bool) This method returns true if all devices in
the group are alive, false otherwise.
Throws:
read_attribute ( self, attr_name, forward=True) -> sequence<GroupAttrReply>
- Just a shortcut to do:
- self.read_attribute_reply(self.read_attribute_asynch(...))
read_attribute_asynch (self, attr_name, forward=True, reserved=-1 ) -> int
Reads an attribute on each device in the group asynchronously. The method sends the request to all devices and returns immediately.
Parameters:
attr_name: (str) Name of the attribute to read. forward: (bool) If it is set to true (the default) request is forwarded to subgroups. Otherwise, it is only applied to the local set of devices. reserved: (int) is reserved for internal purpose and should not be used. This parameter may disappear in a near future. Return: (int) request id. Pass the returned request id to Group.read_attribute_reply() to obtain the results.
Throws:
read_attribute_reply (self, req_id, timeout_ms=0 ) -> sequence<GroupAttrReply>
Returns the results of an asynchronous attribute reading.
Parameters:
req_id: (int) a request identifier previously returned by read_attribute_asynch. timeout_ms: (int) For each device in the hierarchy, if the attribute value is not yet available, read_attribute_reply wait timeout_ms milliseconds before throwing an exception. This exception will be part of the global reply. If timeout_ms is set to 0, read_attribute_reply waits “indefinitely”. Return: (sequence<GroupAttrReply>)
Throws:
read_attributes ( self, attr_names, forward=True) -> sequence<GroupAttrReply>
- Just a shortcut to do:
- self.read_attributes_reply(self.read_attributes_asynch(...))
read_attributes_asynch (self, attr_names, forward=True, reserved=-1 ) -> int
Reads the attributes on each device in the group asynchronously. The method sends the request to all devices and returns immediately.
Parameters:
attr_names: (sequence<str>) Name of the attributes to read. forward: (bool) If it is set to true (the default) request is forwarded to subgroups. Otherwise, it is only applied to the local set of devices. reserved: (int) is reserved for internal purpose and should not be used. This parameter may disappear in a near future. Return: (int) request id. Pass the returned request id to Group.read_attributes_reply() to obtain the results.
Throws:
read_attributes_reply (self, req_id, timeout_ms=0 ) -> sequence<GroupAttrReply>
Returns the results of an asynchronous attribute reading.
Parameters:
req_id: (int) a request identifier previously returned by read_attribute_asynch. timeout_ms: (int) For each device in the hierarchy, if the attribute value is not yet available, read_attribute_reply wait timeout_ms milliseconds before throwing an exception. This exception will be part of the global reply. If timeout_ms is set to 0, read_attributes_reply waits “indefinitely”. Return: (sequence<GroupAttrReply>)
Throws:
remove (self, patterns, forward=True) -> None
Removes any group or device which name matches the specified pattern.
The pattern parameter can be a group name, a device name or a device name pattern (e.g domain_*/family/member_*).
Since we can have groups with the same name in the hierarchy, a group name can be fully qualified to specify which group should be removed. Considering the following group:
-> gauges | -> cell-01 | |-> penning | | |-> ... | |-> pirani | |-> ... | -> cell-02 | |-> penning | | |-> ... | |-> pirani | |-> ... | -> cell-03 | |-> ... | | -> ...A call to gauges->remove(“penning”) will remove any group named “penning” in the hierarchy while gauges->remove(“gauges.cell-02.penning”) will only remove the specified group.
Parameters:
patterns: (str | sequence<str>) A string with the pattern or a list of patterns.
forward: (bool) If fwd is set to true (the default), the remove request is also forwarded to subgroups. Otherwise, it is only applied to the local set of elements. For instance, the following code remove any stepper motor in the hierarchy:
root_group->remove(“/stepper_motor/“);
Return: None
Throws:
remove_all (self) -> None
Removes all elements in the _RealGroup. After such a call, the _RealGroup is empty.
set_timeout_millis (self, timeout_ms) -> bool
Set client side timeout for all devices composing the group in milliseconds. Any method which takes longer than this time to execute will throw an exception.
Parameters:
timeout_ms: (int) Return: None
Throws: (errors are ignored)
New in PyTango 7.0.0
write_attribute ( self, attr_name, value, forward=True) -> sequence<GroupReply>
- Just a shortcut to do:
- self.write_attribute_reply(self.write_attribute_asynch(...))
write_attribute_asynch (self, attr_name, value, forward=True, reserved=-1 ) -> int
Writes an attribute on each device in the group asynchronously. The method sends the request to all devices and returns immediately.
Parameters:
attr_name: (str) Name of the attribute to write. value: (any) Value to write. See DeviceProxy.write_attribute forward: (bool) If it is set to true (the default) request is forwarded to subgroups. Otherwise, it is only applied to the local set of devices. reserved: (int) is reserved for internal purpose and should not be used. This parameter may disappear in a near future. Return: (int) request id. Pass the returned request id to Group.write_attribute_reply() to obtain the acknowledgements.
Throws:
write_attribute_reply (self, req_id, timeout_ms=0 ) -> sequence<GroupReply>
Returns the acknowledgements of an asynchronous attribute writing.
Parameters:
req_id: (int) a request identifier previously returned by write_attribute_asynch. timeout_ms: (int) For each device in the hierarchy, if the acknowledgment is not yet available, write_attribute_reply wait timeout_ms milliseconds before throwing an exception. This exception will be part of the global reply. If timeout_ms is set to 0, write_attribute_reply waits “indefinitely”. Return: (sequence<GroupReply>)
Throws:
Group member functions do not return the same as their DeviceProxy counterparts, but objects that contain them. This is:
- write attribute family returns PyTango.GroupReplyList
- read attribute family returns PyTango.GroupAttrReplyList
- command inout family returns PyTango.GroupCmdReplyList
The Group*ReplyList objects are just list-like objects containing GroupReply, GroupAttrReply and GroupCmdReply elements that will be described now.
Note also that GroupReply is the base of GroupCmdReply and GroupAttrReply.
This is the base class for the result of an operation on a PyTangoGroup, being it a write attribute, read attribute, or command inout operation.
It has some trivial common operations:
- has_failed(self) -> bool
- group_element_enabled(self) ->bool
- dev_name(self) -> str
- obj_name(self) -> str
- get_err_stack(self) -> DevErrorList
Bases: PyTango._PyTango.GroupReply
get_data (self, extract_as=ExtractAs.Numpy) -> DeviceAttribute
Get the DeviceAttribute.
Parameters:
extract_as: (ExtractAs) Return: (DeviceAttribute) Whatever is stored there, or None.
Bases: PyTango._PyTango.GroupReply
get_data (self) -> any
Get the actual value stored in the GroupCmdRply, the command output value. It’s the same as self.get_data_raw().extract()
Parameters: None Return: (any) Whatever is stored there, or None.
get_data_raw (self) -> any
Get the DeviceData containing the output parameter of the command.
Parameters: None Return: (DeviceData) Whatever is stored there, or None.