Show error if example is run without support files. (#2189)

Author: janiversen

examples/client_async.py

@@ -28,8 +28,16 @@
 """
 import asyncio
 import logging
+import sys
 
-import helper
+
+try:
+    import helper
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
 import pymodbus.client as modbusClient
 from pymodbus import ModbusException

examples/client_async_calls.py

@@ -31,9 +31,16 @@
 """
 import asyncio
 import logging
+import sys
 
-import client_async
 
+try:
+    import client_async
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
 _logger = logging.getLogger(__file__)
 _logger.setLevel("DEBUG")

examples/client_calls.py

@@ -30,8 +30,17 @@
     ./server_async.py
 """
 import logging
+import sys
+
+
+try:
+    import client_sync
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
-import client_sync
 
 
 _logger = logging.getLogger(__file__)

examples/client_payload.py

@@ -7,9 +7,17 @@
 Works out of the box together with payload_server.py
 """
 import asyncio
+import sys
 from collections import OrderedDict
 
-import client_async
+
+try:
+    import client_async
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
 from pymodbus.constants import Endian
 from pymodbus.payload import BinaryPayloadBuilder, BinaryPayloadDecoder

examples/client_sync.py

@@ -31,8 +31,16 @@
 
 """
 import logging
+import sys
 
-import helper
+
+try:
+    import helper
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
 import pymodbus.client as modbusClient
 from pymodbus import ModbusException

examples/modbus_forwarder.py

@@ -18,8 +18,16 @@
 """
 import asyncio
 import logging
+import sys
 
-import helper
+
+try:
+    import helper
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
 from pymodbus.client import ModbusTcpClient
 from pymodbus.datastore import ModbusServerContext

examples/server_async.py

@@ -34,8 +34,16 @@
 """
 import asyncio
 import logging
+import sys
 
-import helper
+
+try:
+    import helper
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
 from pymodbus import __version__ as pymodbus_version
 from pymodbus.datastore import (

examples/server_callback.py

@@ -6,8 +6,16 @@
 """
 import asyncio
 import logging
+import sys
 
-import server_async
+
+try:
+    import server_async
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
 from pymodbus.datastore import (
     ModbusSequentialDataBlock,

examples/server_payload.py

@@ -6,8 +6,17 @@
 """
 import asyncio
 import logging
+import sys
+
+
+try:
+    import server_async
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
-import server_async
 
 from pymodbus.constants import Endian
 from pymodbus.datastore import (

examples/server_sync.py

@@ -35,9 +35,17 @@
 a lot slower.
 """
 import logging
+import sys
 
-import helper
-import server_async
+
+try:
+    import helper
+    import server_async
+except ImportError:
+    print("*** ERROR --> THIS EXAMPLE needs the example directory, please see \n\
+          https://pymodbus.readthedocs.io/en/latest/source/examples.html\n\
+          for more information.")
+    sys.exit(-1)
 
 # --------------------------------------------------------------------------- #
 # import the various client implementations