Lopping duplicate the first and last row in pandas data frame

Question

I have the below dataframe:

   id     a       b

    1     1       5

    2    -5       0

    3     0       5

    4     5       6

and I  am trying to duplicate the first and last row of the dataframe:

   id     a       b

    1     1       5

    1     1       5

    2    -5       0

    3     0       5

    4     5       6

    4     5       6

I have many data frames in the list so I am trying to using this code:

for df in list:

    pd.concat([df.head(1), df], axis=1)

    pd.concat([df.tail(1), df], axis=1)

It is not working, can anyone help me solve it?

Answer 1

Check the below code:

for i, df in enumerate(list):

    list[i] = pd.concat([df.head(1), df ,df.tail(1)], axis=1)

If you want to know more about the Data Science then do check out the following Data Science which will help you in understanding Data Science from scratch