def countday(t): s = 0 f = 0 for i in range(len(t)): if i < len(t)-1: if t[i+1] == (t[i] + 1): s = s+1 f = max(f, s) else: s = 0 return f+1 import pandas as pd pf = pd.read_csv('nowcoder.csv')[['user...