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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: executing commands
import sys
from tango import DeviceProxy, DevFailed, Except
dev_name = "sys/tg_test/1"
cmd_name = "DevShort"
# step 1 create the device proxy
try:
dev = DeviceProxy(dev_name)
print(f"proxy for {dev_name} created")
except DevFailed as ex:
print("failed to create DeviceProxy")
Except.print_exception(ex)
sys.exit(1)
try:
data_out = dev.command_inout("DevShort", 1234)
print(f"command_inout DevShort result: {data_out}")
my_dbl = 1.22 # here my_dbl is a float
my_str = "ABC" # here my_str is a string
print(
f"types of variables before data_out extraction: "
f"{type(data_out)}, {type(my_dbl)}, {type(my_str)}"
)
my_dbl = data_out # here my_dbl turns into a short
my_str = data_out # here my_str turns into a short
print(
f"command_inout DevVoid results extracted to existing variable: "
f"{data_out}, {my_dbl}, {my_str}, {type(data_out)}, {type(my_dbl)}, {type(my_str)}"
)
# type of variables changes if handled by python! powerful, easy, can play tricks...
except DevFailed as ex:
print("failed to execute command DevShort")
# now with DevVoid
try:
dev.command_inout("DevVoid")
print("command_inout DevVoid OK")
except DevFailed as ex:
print("failed to execute command DevVoid")
"""
Typical output:
➜ training git:(develop) ✗ docker-compose exec cli /training/client/command01.py
proxy for sys/tg_test/1 created
command_inout DevShort result: 1234
types of variables before data_out extraction: <class 'int'>, <class 'float'>, <class 'str'>
command_inout DevVoid results extracted to existing variable: 1234, 1234, 1234, <class 'int'>, <class 'int'>, <class 'int'>
command_inout DevVoid OK
"""
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