s = pd.Series({'a': False, 'b': True, 'c': False, 'd': True, 'e': False})

>> s
a    False
b     True
c    False
d     True
e    False
dtype: bool

sdict = s.to_dict()
for item in list(sdict):
    if sdict[item] == True:
        print (item, end=" ")

>> b d

print (s.index[s])
Index(['b', 'd'], dtype='object')