pandas.Series.str.index

Series.str.index(sub, start=0, end=None) [source]

Return lowest indexes in each strings where the substring is fully contained between [start:end]. This is the same as str.find except instead of returning -1, it raises a ValueError when the substring is not found. Equivalent to standard str.index.

Parameters:
sub : str

Substring being searched

start : int

Left edge index

end : int

Right edge index

Returns:
found : Series/Index of objects

See also

rindex
Return highest indexes in each strings.

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https://pandas.pydata.org/pandas-docs/version/0.24.2/reference/api/pandas.Series.str.index.html