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# Mapping NaN values to 0 and non-NaN values to 1 in Pandas DataFrame

schedule Aug 12, 2023
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# Solution

To map `NaN` values to `0` and non-`NaN` values to `1` in Pandas DataFrame, use the following:

``` df.notnull().astype("int") ```

# Example

Consider the following DataFrame:

``` df = pd.DataFrame({"A":[3,None],"B":[5,6]})df A B0 3.0 51 NaN 6 ```

To map `NaN` values to `0` and non-`NaN` values to `1`:

``` df.notnull().astype("int") A B0 1 11 0 1 ```

## Explanation

We first map the `NaN` values to `False` and non-`NaN` values to `True` using the `notnull()` method:

``` df.notnull() A B0 True True1 False True ```

We then map `False` to `0` and `True` to `1` using the `astype()` method:

``` df.notnull().astype("int") A B0 1 11 0 1 ```

# Supplement - mapping certain columns

The solution presented performs the mapping for all columns, that is, every value in the DataFrame. To map certain columns only:

``` df = pd.DataFrame({"A":[3,None],"B":[5,6]})df["A"] = df["A"].notnull().astype("int")df A B0 1 51 0 6 ```

Notice how only column `A`'s values were mapped, while column `B` was left intact.

Published by Isshin Inada
Edited by 0 others
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