pandas fillna()

转自 https://blog.csdn.net/y12345678904/article/details/72457486

fillna()会填充nan数据，返回填充后的结果。如果希望在原DataFrame中修改，则把inplace设置为True

     
     
     
     

      
      
      
      

       
       
       
       

        
        
        
        

       
       
       
       
       
       
       
       

        
        
        
        

         
         
         
         df = pd.DataFrame({
         
         
         
         ‘id’:[
         
         
         
         1, 
         
         
         
         2, nan, 
         
         
         
         4, nan, 
         
         
         
         6, 
         
         
         
         1, 
         
         
         
         2, 
         
         
         
         3], 
         
         
         
         ‘item1’:[
         
         
         
         1, 
         
         
         
         2, 
         
         
         
         3, 
         
         
         
         4, nan, 
         
         
         
         6, 
         
         
         
         1, 
         
         
         
         2, 
         
         
         
         3], 
         
         
         
         ‘item2’:[
         
         
         
         1, 
         
         
         
         2, 
         
         
         
         3, 
         
         
         
         4, 
         
         
         
         5, 
         
         
         
         6, 
         
         
         
         1, nan, 
         
         
         
         3]})
        
        
        
        
       
       
       
       
      
      
      
      

       
       
       
       

        
        
        
        

       
       
       
       
       
       
       
       

        
        
        
        

         
         
         
         print(df)
        
        
        
        
       
       
       
       
      
      
      
      

       
       
       
       

        
        
        
        

       
       
       
       
       
       
       
       

        
        
        
        

         
         
         
         df.fillna(
         
         
         
         0, inplace = 
         
         
         
         True)
        
        
        
        
       
       
       
       
      
      
      
      

       
       
       
       

        
        
        
        

       
       
       
       
       
       
       
       

        
        
        
        

         
         
         
         print(df)