I have df which looks like this:
Label Base
Label
Très à gauche 4.51
Très à droite 10
You probably want to filter out the rows you don't want included in your sort operation:
d = df_table
condition = (d.Label=='A gauche') | (d.Label=='A droite')
excluded = d[condition]
included = d[~condition]
Which can then be sorted
sorted = included.sort(columns="Base",ascending=True)
And if you want the excluded rows appended to the end of your data frame, you could do this:
pandas.concat([sorted,excluded])