label related data, and count results

[AileYG]

I have used the label expression 'Label a related table' (one-to many) and it works just fine, but I would like to go one step further and 'count' repited values in the resulted label.

I just can't seem to figure out how to write it with python...

def FindLabel ([keyField], [FirstLabel]):
    import arcpy

    key1 = [keyField] # Key field in feature class
    key2 = "ID"   # Key field in related table
    L = [FirstLabel] # Label field in feature class
    L2 = "Label2"   # Label field in related table
    myDataTable = r"<path-to-related-table>"   # Path to related table
    
    cur = arcpy.da.SearchCursor(myDataTable, [key2, L2])
    for row in cur:
        if str(key1) == str(row[0]): 
            L = L + " " + str(row[1])
    return L

So the idea is to count row[1], for expample if there is 4 relations where the resulted label is "red red red green", I would like to show: "3 red, 1 green" . 

Is this possible?

[JohannesLindner]

def FindLabel ( [GewässerID] , [OBJECTID]):
    import arcpy
    key_val = [GewässerID]
    label_1 = [OBJECTID]
    rel_table =  'path:/to/related/table'
    rel_key_field = "GewässerID"
    rel_label_field = "SegmentTyp"
    where = f"{rel_key_field} = {key_val}"
    rel_values = [r[0] for r in arcpy.da.SearchCursor(rel_table, [rel_label_field], where)]
    distinct = list(set(rel_values))
    numbers = [rel_values.count(d) for d in sorted(distinct)]
    label_2 = ", ".join([f"{n} {v}" for n, v in zip(numbers, distinct)])
    return f"{label_1}: {label_2}"
    

[AileYG]

Thanks for your your answer! 

Though it's not working quite as expected, since the function list(set(rel_values)) it separating the words into letters, and in the end counting the letter for each word...  any suggestion on how I can fix that?

I have  sadly very limited experience with python...

[JohannesLindner]

Hmm, it worked for my test data. Can you post your related table (the actual table or a screenshot of the label field)

[AileYG]

I can see the logic in it... but it is not working on my data.
I can't post the table, but the label field is just text with values 'Inde' or 'Ude'. 

I have also tried to use .count('Inde') values, and the result is still a separated list like "1, 1 ,0, 1" ... 

Thank you very much for the help! It gave me some ideas to keep testing..