Invoking Python Method inside of For Each Loop

I am looping through an array of tuples of two strings. I pass the first item of an instance of a tuple inside of a for each loop to an ‘Invoke Python Method’ activity. For some reason, the automation gets stuck at the ‘Invoke Python Method’ activity.

When I use the exact same code, but rather than looping through an array of tuples of two strings, I loop through an array of strings, everything works perfectly.

I am attaching my code. Any feedback would be much appreciated!
Invoke Python (40.7 KB)

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Hi All,

If anyone has time to look into the matter above, it would be greatly appreciated. I noticed the following members have responded to similar inquiries in the past:

@StefanSchnell @Sergiu.Wittenberger @loginerror

I think this would be a very fruitful exercise for all!

Thank you in advance.


Hello Rullah,
the normalizer package is not available.
Best regards


1 Like

Hi Stefan,

My apologies for not uploading the Normalizer. Please see attached:

Normalizer - (10.7 KB)



Hello Rullah,
to understand your approach correct, let me ask about the differences.

On the one hand you have this …

Tuple<string, string>[] str4SequenceDiff = {
  Tuple.Create("Tor", "Tier"),
  Tuple.Create("Ball", "Knall"),
  Tuple.Create("Hase", "Nase")

… and on the other hand you have this.

string[] str4SequenceDiff = {
  "Tor", "Tier",
  "Ball", "Knall",
  "Hase", "Nase"

Is that correct?

Thanks and best regards

Yes, this is exactly correct. I store Item1 of the Tuple into a variable called “secondText.” The word that I am comparing it to is a regular variable called “secondText.” I then pass the variables into the “InputParameters” property of the Invoke Python Method activity as an iEnumerable:

InputParamters: {firstText, secondText}

When I run the automation, it gets stuck at the InvokePython method. I end up stopping the run. That is why I do not have an error message that is of any value. I think there is something about storing an Item of a tuple into a variable and then passing it into the Invoke Python Method that is causing the issue.

Please see attached screenshot of Invoke Python Method’s properties.



Hello Rullah,
I defined this sequence variables:

And this in the Invoke Code activity:

And I get this error:


It seems that there are a problem with this kind of data type.

Best regards

Thank you Stefan. Much appreciated. I came to a similar conclusion but wanted to verify. I think this might be something we should notify UiPath about. @system

Is this a feature which will be added to later versions of UiPath?

1 Like