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#!/usr/bin/env python3
# SPDX-FileCopyrightText: All Contributors to the PyTango project
# SPDX-License-Identifier: LGPL-3.0-or-later
#
# client example: reading an attribute, also with simplified syntax
import sys
from tango import DeviceProxy, DevFailed, Except
dev_name = "sys/tg_test/1"
attr_name = "double_scalar"
# step 1 - create the device proxy
try:
dev = DeviceProxy(dev_name)
print(f"proxy for {dev_name} created")
except DevFailed as ex:
Except.print_exception(ex)
sys.exit(1)
# step 2 - read the attribute
try:
da = dev.read_attribute(attr_name)
print(f"attribute.name: {da.name}")
print(f"attribute.timestamp: {da.get_date()}")
print(f"attribute.quality: {da.quality}")
print(f"attribute.dim_x: {da.dim_x}")
print(f"attribute.type: {da.type}")
print(f"attribute.value: {da.value}")
except DevFailed as ex:
Except.print_exception(ex)
print("failed to read attribute")
sys.exit(1) # simplistic error handling
# set a value with Jive and check the result here
try:
# read the attribute again
da = dev.read_attribute(attr_name)
print(f"attribute.value (reading): {da.value}")
print(f"attribute.w_value (setting): {da.w_value}")
except DevFailed as ex:
Except.print_exception(ex)
print("failed to read attribute")
sys.exit(1)
"""
Typical output:
➜ training git:(develop) ✗ docker-compose exec cli /training/client/reading02.py
proxy for sys/tg_test/1 created
attribute.name: double_scalar
attribute.timestamp: 2021-06-30 20:07:50.801692
attribute.quality: ATTR_VALID
attribute.dim_x: 1
attribute.type: DevDouble
attribute.value: -226.03415499895206
attribute.value (reading): -226.03415499895206
attribute.w_value (setting): 0.0
"""
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