How to shift data frame rows of specified column

[Mekala]

Hi,
I have dataframe, I wan to define new column same as Column1, and re-arrange the new columns rows as:
new_col rows 0-end should be replaced with first column row1-end

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import pandas as pd df = pd.DataFrame({'Col1': [1, 2, 3, 4, 5],'Col2': [6, 7, 8, 9, 10],                    'Col3': [11, 12, 13, 14, 15]})   df['new_col'] = df['Col1'] df[0:-1,'new_col']=df.ix[1:,'Col1']

TypeError: unhashable type: 'slice'

my desired output:

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Col1  Col2 Col3 new_col 1     6    11   2 2     7    12   3 3     8    13   4 4     9    14   5 5     10   15   5

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I use this way, and it works:
df['new_col']=df['new_col'].shift(-1)