How to justify (left) a column of strings in pandas dataframe?

I have a dataframe with several columns. I use Jupyter. One of the columns is just strings, the particular column name is empty ' ':

df = pd.DataFrame([[""], [""], [""], ['*'], ['* <<']],
                  columns=[''],
                  index=[0, 1, 2, 3, 4])

print(df)

0    
1    
2    
3   * <<
4      *

How can I justify left, so it looks like this:

print(df)

0    
1    
2    
3   * <<
4   *

Note: if I just use df, instead of print(df), it justifies well.