locate the numeric position of a non numeric index value

Question

Consider the series s below:

s = pd.Series(np.arange(18, 0, -3), list(\'ABCDEF\'))
s

A    18
B    15
C    12
D     9
E     6
F     3
dtype: int         


        

Answer 1

Use np.searchsorted -

np.searchsorted(s.index.values,'D')

Or use the method, like so -

s.index.searchsorted('D')

Answer 2

You can use Index.get_loc:

print(s.index.get_loc('D'))
3

Answer 3

m = s.index == 'D'
idx = m.argmax() if m.any() else None