如何在pandas数据帧的每一行的开头添加动态数量的空格？

Question

如何将df的每一行填充到左侧，并留出足够的空格以确保行总计30个字符？

我尝试沿着这条路走下去，但它没有用，我相信ljust已被弃用：

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

目前：

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

我在寻找：

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

最终解决方案：

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

Answer 1

我认为您可以使用str.rjust：

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

Answer 2

这应该有效：

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