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# Getting integer index of value in Pandas Series

schedule Aug 12, 2023
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To get the integer index of values in a Series, use NumPy's `where(~)` method:

``` s = pd.Series([3,7,5], index=["a","b","c"])np.where(s==7) # returns a tuple containing NumPy array (array([1]),) ```

When there are duplicates:

``` s = pd.Series([3,7,5,7], index=["a","b","c","d"])np.where(s==7) (array([1, 3]),) ```

When the value does not exist:

``` s = pd.Series([3,7,5], index=["a","b","c"])np.where(s==4) (array([], dtype=int64),) ```
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