Invoke Python Method not working when using any import

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1

A bizzare thing I have observed.
When using a simple function that returns a string works fine with Invoke Python Method activity, but same activity throwing the error: Invoke Python Method: One or more errors occurred. (Error invoking Python method) when using a simple import like os or pandas.

Could someone please help me on this?

2

Hi @Aakash_Singh_Rawat

I tested a few things just now to see what this could be. For the record - I am using Python 1.8.1 package with Python 3.12 runtime installed in the default location: %localappdata%\Programs\Python\Python312

I first created a very simple script and tested that it works, and it did:

import random

def dummy_func():
    greetings = ["hello", "hi", "hey", "greetings", "salutations"]
    return random.choice(greetings)

I then added 1 line and it started crashing with a “Pipe is broken” error. Is this the same error that you are getting?

import random
import pandas as pd

def dummy_func():
    greetings = ["hello", "hi", "hey", "greetings", "salutations"]
    return random.choice(greetings)


24.10.5+Branch.master.Sha.a5ea2e718723dd973312e8e94aec556989027735.a5ea2e718723dd973312e8e94aec556989027735

Source: Invoke Python Method

Message: Pipe is broken.

Exception Type: System.IO.IOException

System.IO.IOException: Pipe is broken.   at System.IO.Pipes.PipeStream.CheckWriteOperations()
   at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
   at UiPath.Python.Service.PythonProxy.RequestAsync(PythonRequest request, CancellationToken ct)
   at UiPath.Python.Service.PythonProxy.Shutdown()
   at UiPath.Python.Impl.OutOfProcessEngine.Release()
   at UiPath.Python.Activities.PythonScope.Cleanup()
   at UiPath.Python.Activities.PythonScope.OnFaulted(NativeActivityFaultContext faultContext, Exception propagatedException, ActivityInstance propagatedFrom)
   at System.Activities.Runtime.FaultCallbackWrapper.FaultWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)

So I went ahead to my installation location and run a CMD to see if everything is fine there, and it was not:

I went ahead and installed the package:

And verified that it is correctly installed:

And after that, the same slightly modified script from above worked just fine in Studio:

My next step was to slightly modify the script to actually use the imported package:

import random
import pandas as pd

def dummy_func():
    greetings = ["hello", "hi", "hey", "greetings", "salutations"]
    return random.choice(greetings)

def dummy_func2():
    data = {'Name': ['Alice', 'Bob', 'Charlie'], 'Age': [25, 30, 35]}
    df = pd.DataFrame(data)
    return df.to_string()

And this worked as well in Studio:

I hope this is helpful :slight_smile: