CODEWITHSUNDEEP
pythonpandasdataframe
Redratz
Redratz

Reputation: 136

Pandas DF replace next value

I have a pandas df containing a race_id, a racer_id, and an elo. I'm attempting to update the elos of each racer after each race.

The data looks like this:

race_id racer_id elo
0 1 1500
0 2 1500
0 3 1500
0 4 1500
1 1 1500
1 2 1500
1 3 1500
1 4 1500

I'm trying to update the elo of the racer after the race occurs. i.e. in the above table, after race_id 0, the elos for race_id 1 would be changed to reflect the outcome of race_id 0.

Basically, I can't figure out how to get pandas to update the next occurrence of the racer_id with their new elo.

I should also clarify that this is a dataset of tens of thousands of racers and races. So it could be multiple races before that same racer appears again. The data is sorted by race_id.

Upvotes: 1

Views: 168

Answers (1)

a-boubekri
a-boubekri

Reputation: 46

You can use DataFrame.itertuples ()

for row in df.itertuples():
    df.set_value(row.index, YOUR_VALUE_UPDATED, row.elo)

Upvotes: 1

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