Answers for "pandas sort column values descending"

sort a dataframe by a column valuepython

>>> df.sort_values(by=['col1'])
    col1 col2 col3
0   A    2    0
1   A    1    1
2   B    9    9
5   C    4    3
4   D    7    2
3   NaN  8    4

reverse column order pandas

import pandas as pd

df = pd.DataFrame({'a':[1,2,3],
                   'b':[4,5,6,],
                   'c':[7,8,9,]})

df_col_reversed = df.loc[:, ::-1] # reverse column order
df_row_reversed = df.loc[::-1, :] # reverse row order