How to shift a column in Pandas DataFrame

Question

I would like to shift a column in a Pandas DataFrame, but I haven't been able to find a method to do it from the documentation without rewriting the whole DF. Does anyone know how to do it? DataFrame:

##    x1 x2

##0  206 214

##1  226 234

##2  245 253

##3  265 272

##4  283 291

Desired output:

 

##    x1 x2

##0  206 nan

##1  226 214

##2  245 234

##3  265 253

##4  283 272

##5  nan 291

Answer 1

Just refer to the following code:

In [18]: a

Out[18]: 

   x1  x2

0   0 5

1   1 6

2   2 7

3   3 8

4   4 9

In [19]: a.x2 = a.x2.shift(1)

In [20]: a

Out[20]: 

   x1  x2

0   0 NaN

1   1 5

2   2 6

3   3 7

4   4 8

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