如何在pandas数据帧的每一行的开头添加动态数量的空格？

Question

How would I pad each row of the df to the left with enough spaces to ensure the row totals 30 characters?

I tried going down this path, but it didn't work and I believe ljust is deprecated:

'{: <30}'.format(df['test1'])

Currently:

>>> df['test1']
0    1234jjjjjjjdddd
1    1234jjjjjjjdd
2    1234jjjjjjjddddddddd
3    1234jjjjjjjddd
4    1234jjjjjjjdddddd

What I'm looking for:

>>> df['test1']
0                   1234jjjjjjjdddd
1                     1234jjjjjjjdd
2              1234jjjjjjjddddddddd
3                    1234jjjjjjjddd
4                 1234jjjjjjjdddddd

Final Solution:

df['test1'] = df.test1.str.rjust(30,' ') 

Answer 1

I think you can use str.rjust :

print (df.test1.str.rjust(30, ' '))
0                   1234jjjjjjjdddd
1                     1234jjjjjjjdd
2              1234jjjjjjjddddddddd
3                    1234jjjjjjjddd
4                 1234jjjjjjjdddddd
Name: test1, dtype: object

Answer 2

This should work:

spaces = " " * 30
df['test1'] = [spaces[-len(i):] + i for i in df['test1']]