在熊猫系列python中查找字符串

Question

I cannot figure out how to find a string in a pandas series:

mydata = np.array(['ab','ac','ad','ae'])
myserie = pd.Series(mydata) # this is because I don't know how to initialise a series directly ... :(

I am looking for the index of the string ac .

I have tried myserie.str.find('ac') but that returns

Out[270]: 
0   -1
1   -1
2   -1
3   -1
dtype: int64

which has two problems: I want only the index of the ac string (which out be 1), and well, it doesn't spot it.... what am I doing wrong? what would work?

Answer 1

Use Series.str.contains for test substring:

idx = myserie.index[myserie.str.contains('ac')]

If need exact match use == or Series.eq :

idx = myserie.index[myserie.eq('ac')]
print (idx)
Int64Index([1], dtype='int64')

For scalar use next with iter trick for return value also if no match:

out = next(iter(idx), 'no match')
print (out)
1