Moving desired row to the top of pandas Data Frame
<p>In <code>pandas</code>, how can I copy or move a row to the top of the Data Frame without creating a copy of the Data Frame?</p>

<p>For example, I managed to do almost what I want with the code below, but I have the impression that there might be a better way to accomplish this:</p>

<pre><code>import pandas as pd

df = pd.DataFrame({'Probe':['Test1','Test2','Test3'], 'Sequence':['AATGCGT','TGCGTAA','ATGCATG']})

df

   Probe Sequence
0  Test1  AATGCGT
1  Test2  TGCGTAA
2  Test3  ATGCATG

df_shifted = df.shift(1)

df_shifted

   Probe Sequence
0    NaN      NaN
1  Test1  AATGCGT
2  Test2  TGCGTAA


df_shifted.ix[0] = df.ix[2]

df_shifted

   Probe Sequence
0  Test3  ATGCATG
1  Test1  AATGCGT
2  Test2  TGCGTAA
</code></pre>