Python 将DataFrame中的序列反转为新列

如何将DataFrame中序列的顺序反转到新列中？

data = [["US Dollar", 7.00],
        ['Euro', 2.00],
        ['British Pound', 4.00],
        ['Indian Rupee', 2.00],
        ['Australian Dollar', 9.00],
        ['Canadian Dollar', 3.00],
        ['Singapore Dollar', 3.00],
        ['Swiss Franc', 5.00]
       ]

df = pd.DataFrame(data, columns=['Currency', 'Order'])

我试着使用loc来做这件事，但这给了我相同的命令.

df['Reverse Order'] = df['Order'].iloc[::-1]
df


#   Currency            Order   Reverse Order
# 0 US Dollar           7.0     7.0
# 1 Euro                2.0     2.0
# 2 British Pound       4.0     4.0
# 3 Indian Rupee        2.0     2.0
# 4 Australian Dollar   9.0     9.0
# 5 Canadian Dollar     3.0     3.0
# 6 Singapore Dollar    3.0     3.0
# 7 Swiss Franc         5.0     5.0

我在试着得到相反的顺序

#   Currency            Order   Reverse Order
# 0 US Dollar           7.0     5.0
# 1 Euro                2.0     3.0
# 2 British Pound       4.0     3.0
# 3 Indian Rupee        2.0     9.0
# 4 Australian Dollar   9.0     2.0
# 5 Canadian Dollar     3.0     4.0
# 6 Singapore Dollar    3.0     2.0
# 7 Swiss Franc         5.0     7.0