human
How to rearrange Pandas column sequence?
assistant
Here is some code to rearrange the columns 'a','b','x','y' of pandas DataFrame `df` in mentioned sequence 'x' ,'y','a' ,'b'

df = df[['x', 'y', 'a', 'b']]

#Warning: this code generation is experimental. Please inspect the code for any bugs before executing.