My function stops on the first value and I want it to keep going

Question

I'm working on a dashboard with information about tennis professional players.

I got this for loop and I'm getting the desired output:

for ind in df.index:
    if df['Winner'][ind] == 'Nadal R.' and df['Loser'][ind] == 'Djokovic N.':
        print(df.iloc[ind]['Location'], ': ', df.iloc[ind]['Wsets'], '-', df.iloc[ind]['Lsets'])

OUTPUT:

Madrid :  2.0 - 0.0
Rome :  2.0 - 0.0
Rome :  2.0 - 1.0
Paris :  3.0 - 0.0
Rome :  2.0 - 1.0

But when I try to pass it into my dash app I have to create a function for the callback to work.

So I defined the following function (notice that input_value1 and input_value_2 are the same that in the code above by default):

def update_output_div(input_value1, input_value2):

    for ind in df.index:
        if df['Winner'][ind] == input_value1 and df['Loser'][ind] == input_value2:
            return df.iloc[ind]['Location'], ': ', df.iloc[ind]['Wsets'], '-', df.iloc[ind ['Lsets']

OUTPUT:

Madrid :  2.0 - 0.0

What I want to do is to display on my dash app the same output as the code on top.

(btw the reason for the single line output from your function is that you use `return` which promptly terminates the function. Compare this to `print()` in your first snippet which allows the loop to continue.) — quamrana, Jun 07 '22 at 20:28

score 2 · Answer 1 · answered Jun 07 '22 at 20:30

return closes your function

def update_output_div(input_value1, input_value2):
    res = []
    for ind in df.index:
        if df['Winner'][ind] == input_value1 and df['Loser'][ind] == input_value2:
            res.append(f"{df.iloc[ind]['Location']}: {df.iloc[ind]['Wsets']}-{df.iloc[ind ['Lsets']}")
    return res

My function stops on the first value and I want it to keep going

1 Answers1