filter dataframe rows based on length of column values

Question

I have a pandas dataframe as follows:

df = pd.DataFrame([ [1,2], [np.NaN,1], [\'test string1\', 5]], columns=[\'A\',\'B\'] )

df
              A  B
0                 


        

Answer 1

Use the apply function of series, in order to keep them:

df = df[df['A'].apply(lambda x: len(x) <= 10)]