import pandas as pd
ind = ['A', 'A', 'B', 'C']i
df = pd.DataFrame({'test':range(len(ind))}, index=ind)
rows = ['C', 'B']
res = df.ix[rows]
assert rows == list(res.index) # fails
The problem is that the resulting DataFrame keeps the ordering of the df.index and not the rows key. You'll notice that the rows key doesn't reference a duplicate value.
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