Pandas get second minimum value from datetime column [duplicate]

问题

This question already has answers here:

How to extract the n-th maximum/minimum value in a column of a DataFrame in pandas? (2 answers)

Closed 1 year ago.

I have a data frame with a DateTime column, I can get minimum value by using

df['Date'].min()

How can I get the second, third... smallest values

回答1:

Use nlargest or nsmallest

For second largest,

series.nlargest(2).iloc[-1]

回答2:

Make sure your dates are in datetime first:

df['Sampled_Date'] = pd.to_datetime(df['Sampled_Date'])

Then drop the duplicates, take the nsmallest(2), and take the last value of that:

df['Sampled_Date'].drop_duplicates().nsmallest(2).iloc[-1]

来源：https://stackoverflow.com/questions/57130799/pandas-get-second-minimum-value-from-datetime-column