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# Getting index of value in Series in Pandas

*schedule*Aug 12, 2023

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Tags Python●Pandas

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# Series Index

## Unique case

To get the index of a value in a Series:

```
s[s == 5] # returns a Series
c 5dtype: int64
```

## Duplicate case

For the duplicate case:

```
s[s == 5]
c 5d 5dtype: int64
```

## Non-existent case

When the value you are finding does not exist, you get an empty Series:

```
s[s == 8]
Series([], dtype: int64)
```

# Integer Index

## Unique case

To get the integer index of a value in a Series, first convert the Series into an `Index`

, and then use the `get_loc(~)`

method:

```
```

## Duplicate case

When there are duplicates, we get a NumPy array of booleans where `True`

indicates the location of the value:

```
```

If you want a list of integer indices instead of this boolean mask, use NumPy's `where(~)`

method instead:

```
```

## Non-existent case

If the value does not exist, we get a `KeyError`

:

```
```

Published by Isshin Inada

Edited by 0 others

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