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import pandas as pd
data = {
  "age": [50, 40, 30, 40, 20, 10, 30],
  "qualified": [True, False, False, False, False, True, True]
}
idx = ["Mary", "Sally", "Emil", "Tobias", "Linus", "John", "Peter"]
df = pd.DataFrame(data, index = idx)
newdf = df.sort_index()
print(newdf)
          age  qualified
  Emil     30      False
  John     10       True
  Linus    20      False
  Mary     50       True
  Peter    30       True
  Sally    40      False
  Tobias   40      False