# Ignition edge how to convert a dataset tag into a Python dataset **URL:** \ **Category:** Ignition\ **Tags:** perspective, ignition81\ **Created:** [March 2, 2023, 4:08pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-how-to-convert-a-dataset-tag-into-a-python-dataset/70539 "2023-03-02T16:08:58Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![mrutten](https://avatars.discourse-cdn.com/v4/letter/m/c0e974/32.png) [@mrutten](https://forum.inductiveautomation.com/u/mrutten)\ **Post date:** [March 2, 2023, 4:08pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-how-to-convert-a-dataset-tag-into-a-python-dataset/70539/1 "2023-03-02T16:08:58Z")
I have a button that reads a tag with a dataset and then convert it into a Python dataset just for ease of code. But I cannot get it to work. I am using Ignition Edge version 8.1.24. **Here is my code:** GroupDataSetTagPaths = ["[edge]UT/Loop1\_GroupDataSet"] pyGroupDataSet = system.dataset.toPyDataSet(system.tag.readBlocking(GroupDataSetTagPaths).value) **Here is the tag information:** ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/2/12734449f700fbd752c706da22e1ffc52bea8187.png) **Here is the error code:** 09:55:12.255 [AWT-EventQueue-0] ERROR com.inductiveautomation.ignition.client.util.gui.ErrorUtil - Error running action 'component.onActionPerformed' on UT Platform/Top MenuLoop1Configuration@D/root/ButtonRunLoop1: Traceback (most recent call last): File "function:runAction", line 99, in runAction AttributeError: 'java.util.ArrayList' object has no attribute 'value' com.inductiveautomation.ignition.common.GenericTransferrableException: Traceback (most recent call last): File "function:runAction", line 99, in runAction AttributeError: 'java.util.ArrayList' object has no attribute 'value' ``` at org.python.core.Py.AttributeError(Py.java:178) at org.python.core.PyObject.noAttributeError(PyObject.java:965) at org.python.core.PyObject. __getattr__ (PyObject.java:959) at org.python.pycode._pyx162.runAction$1(:322) at org.python.pycode._pyx162.call_function() at org.python.core.PyTableCode.call(PyTableCode.java:173) at org.python.core.PyBaseCode.call(PyBaseCode.java:306) at org.python.core.PyFunction.function ___call__ (PyFunction.java:474) at org.python.core.PyFunction. __call__ (PyFunction.java:469) at org.python.core.PyFunction. __call__ (PyFunction.java:464) at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:846) at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:828) at com.inductiveautomation.ignition.gateway.project.ProjectScriptLifecycle$TrackingProjectScriptManager.runFunction(ProjectScriptLifecycle.java:832) at com.inductiveautomation.ignition.common.script.ScriptManager$ScriptFunctionImpl.invoke(ScriptManager.java:1009) at com.inductiveautomation.ignition.gateway.project.ProjectScriptLifecycle$AutoRecompilingScriptFunction.invoke(ProjectScriptLifecycle.java:897) at com.inductiveautomation.perspective.gateway.script.ScriptFunctionHelper.invoke(ScriptFunctionHelper.java:147) at com.inductiveautomation.perspective.gateway.action.ScriptAction.runAction(ScriptAction.java:74) at com.inductiveautomation.perspective.gateway.model.ActionCollection$ActionSequence$ExecuteActionsTask.lambda$call$0(ActionCollection.java:263) at com.inductiveautomation.perspective.gateway.api.LoggingContext.mdc(LoggingContext.java:54) at com.inductiveautomation.perspective.gateway.model.ActionCollection$ActionSequence$ExecuteActionsTask.call(ActionCollection.java:252) at com.inductiveautomation.perspective.gateway.model.ActionCollection$ActionSequence$ExecuteActionsTask.call(ActionCollection.java:221) at com.inductiveautomation.perspective.gateway.threading.BlockingTaskQueue$TaskWrapper.run(BlockingTaskQueue.java:154) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.base/java.util.concurrent.FutureTask.run(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at com.inductiveautomation.perspective.gateway.threading.BlockingWork$BlockingWorkRunnable.run(BlockingWork.java:58) at java.base/java.lang.Thread.run(Unknown Source) ``` Caused by: com.inductiveautomation.ignition.common.GenericTransferrableException: AttributeError: 'java.util.ArrayList' object has no attribute 'value' ... 28 common frames omitted ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [March 2, 2023, 4:11pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-how-to-convert-a-dataset-tag-into-a-python-dataset/70539/2 "2023-03-02T16:11:00Z")
`system.tag.readBlocking` returns a list/array of QualifiedValue when given a list. You need something like: ```auto GroupDataSetTagPaths = ["[edge]UT/Loop1_GroupDataSet"] ds = system.tag.readBlocking(GroupDataSetTagPaths)[0].value pyGroupDataSet = system.dataset.toPyDataSet(ds) ``` ---
**Author:** ![mrutten](https://avatars.discourse-cdn.com/v4/letter/m/c0e974/32.png) [@mrutten](https://forum.inductiveautomation.com/u/mrutten)\ **Post date:** [March 2, 2023, 4:16pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-how-to-convert-a-dataset-tag-into-a-python-dataset/70539/3 "2023-03-02T16:16:18Z")
> [@Kevin.Herron](#): > > ```auto > GroupDataSetTagPaths = ["[edge]UT/Loop1_GroupDataSet"] > ds = system.tag.readBlocking(GroupDataSetTagPaths)[0].value > pyGroupDataSet = system.dataset.toPyDataSet(ds) > > ``` Thanks Kevin. That was a quick response. That is one of the many things I like about ignition. The Community is very helpful and respond very quickly. ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [March 2, 2023, 4:35pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-how-to-convert-a-dataset-tag-into-a-python-dataset/70539/4 "2023-03-02T16:35:54Z")
> [@Kevin.Herron](#): > > returns a list/array of QualifiedValue when given a list Even when not given a list... ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [March 2, 2023, 4:42pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-how-to-convert-a-dataset-tag-into-a-python-dataset/70539/5 "2023-03-02T16:42:21Z")
Oh yeah that's right, but there's a confusing special case where it allows you to give it a scalar path instead of a list of paths, but the result is still a list.