熊猫-首次满足条件时查找索引

Question

I have data that looks something like this:

example = pd.Series([0,0,0,2,2,0], index = [2000, 2001, 2002, 2003, 2004, 2005])

How do I find the index corresponding to the first time that a condition is true?

For example, I want to find the index corresponding to the first nonzero entry, which in the example data is 2003.

Answer 1

This will do it:

example.ne(0).idxmax()
#2003

Answer 2

By using nonzero

example.index[example.nonzero()[0][0]]
Out[267]: 2003

Answer 3

example[example != 0].index[0]