Get Location of Max Value in a pandas Series

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import pandas as pd

s = pd.Series(data=[1, None, 4, 3, 4], index=["A", "B", "C", "D", "E"])
s

A    1.0
B    NaN
C    4.0
D    3.0
E    4.0
dtype: float64

pandas.DataFrame.idxmax¶

Return index of first occurrence of maximum over requested axis. NA/null values are excluded.

s.idxmax()

'C'

Return int position of the largest value in the Series. If the maximum is achieved in multiple locations, the first row position is returned.

s.argmax()

2