Pandas DataFrame dropna() Method
Example
Remove all rows wit NULL values from the DataFrame.
In this example we use a .csv file called data.csv
import pandas as pd
df = pd.read_csv('data.csv')
newdf = df.dropna()
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Definition and Usage
The dropna() method removes the rows that
contains NULL values.
The dropna() method returns a new DataFrame
object unless the inplace parameter is set to
True, in that case the
dropna() method does the removing in the original DataFrame instead.
Syntax
dataframe.dropna(axis, how, thresh, subset, inplace)
Parameters
The axis, how,
thresh, subset,
inplace, parameters are
keyword arguments.
| Parameter | Value | Description |
|---|---|---|
| axis | 0 |
Optional, default 0. 0 and 'index'removes ROWS that contains NULL values 1 and 'columns' removes COLUMNS that contains NULL values |
| how | 'all' |
Optional, default 'any'. Specifies whether to remove the row or column when ALL values are NULL, or if ANY vale is NULL. |
| tresh | Number | Optional, Specifies the number of NULL values required to remove the row or column. |
| subset | List | Optional, specifies where to look for NULL values |
| inplace | True |
Optional, default False. If True: the removing is done on the current DataFrame. If False: returns a copy where the removing is done. |
Return Value
A DataFrame with the result, or None if the inplace parameter is set to True.
