Just use index()
a = "aa bb cc"
b = "bb"
print a.index(b)
If the OP wants it to only count letters:
a = "aa bb cc"
b = "bb"
index_t = a.index(b)
real_index = index_t - a[:index_t].count('')
Just use index()
a = "aa bb cc"
b = "bb"
print a.index(b)
If the OP wants it to only count letters:
a = "aa bb cc"
b = "bb"
index_t = a.index(b)
real_index = index_t - a[:index_t].count('')