Pandas Series.fillna() Method
Last Updated :
29 Mar, 2023
Pandas series is a One-dimensional ndarray with axis labels. The labels need not be unique but must be a hashable type. The object supports both integer- and label-based indexing and provides a host of methods for performing operations involving the index.
Pandas Series fillna() Syntax
Pandas Series.fillna() function is used to fill Pandas NA/NaN values using the specified method.
Syntax: Series.fillna(value=None, method=None, axis=None, inplace=False, limit=None, downcast=None, **kwargs)
Parameter :
- value : Value to use to fill holes
- method : Method to use for filling holes in reindexed Series pad / ffill
- axis : {0 or ‘index’}
- inplace : If True, fill in place.
- limit : If method is specified, this is the maximum number of consecutive NaN values to forward/backward fill
- downcast : dict, default is None
Returns : filled : Series
Pandas DataFrame fillna() Examples
Example 1: Use Series.fillna() function to fill out the missing values in the given series object. Use a dictionary to pass the values to be filled corresponding to the different index labels in the series object.
Python3
import pandas as pd
sr = pd.Series([ 'New York' , 'Chicago' , 'Toronto' , None , 'Rio' ])
sr.index = [ 'City 1' , 'City 2' , 'City 3' , 'City 4' , 'City 5' ]
sr.index = index_
print (sr)
|
Output :
Now we will use Series.fillna() function to fill out the missing values in the given series object.
Python3
result = sr.fillna(value = { 'City 4' : 'Lisbon' ,
'City 1' : 'Dublin' })
print (result)
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Output :
As we can see in the output, the Series.fillna() function has successfully filled out the missing values in the given series object.
Example 2: Use Series.fillna() function to fill out the missing values in the given series object using forward fill (ffill) method.
Python3
import pandas as pd
sr = pd.Series([ 100 , None , None , 18 , 65 ,
None , 32 , 10 , 5 , 24 , None ])
index_ = pd.date_range( '2010-10-09' ,
periods = 11 , freq = 'M' )
sr.index = index_
print (sr)
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Output :
Now we will use Series.fillna() function to fill out the missing values in the given series object. We will use forward fill method to fill out the missing values.
Python3
result = sr.fillna(method = 'ffill' )
print (result)
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Output :
As we can see in the output, the Series.fillna() function has successfully filled out the missing values in the given series object.
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