How to calculate percentile score for each row in pandas?

Question

I'm trying to calculate the speed rank of drivers by looking at his/her past 20 race. However, i need to get get current value and rolling values to function. Here what i did so far:

def set_rank(x, y):
    return stats.percentileofscore(x,y)
df['Rank'] = df['SpeedRank'].rolling(20).apply(lambda x: set_rank(x, df['SpeedRank']), raw=True)

The problem is y how can i send value of corresponding row to the function?

Answer 1

I have solved this problem. Here is the solution:

def set_rank(x):
    return stats.percentileofscore(x,x[-1])
df['Rank'] = df['SpeedRank'].rolling(20).apply(set_rank, raw=True)