Compute the running (cumulative) maximum for a series in pandas

Question

Given:

d = {
    \'High\': [954,
             953,
             952,
             955,
             956,
                      


        

Answer 1

Use cummax

df.High.cummax()

0    954
1    954
2    954
3    955
4    956
5    956
6    956
7    956
Name: High, dtype: int64

---

df['Max'] = df.High.cummax()
df