dataframe fillna with 0
df['column'] = df['column'].fillna(0)
                                
                            fillna string
# importing pandas module 
import pandas as pd 
  
# making data frame from csv file 
nba = pd.read_csv("nba.csv") 
  
# replacing na values in college with No college 
nba["College"].fillna( method ='ffill', inplace = True)
                                
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