import pandas
df = pandas.DataFrame([{'c1': 3, 'c2': 10}, {'c1': 2, 'c2': 30}, {'c1': 1,
    'c2': 20}, {'c1': 2, 'c2': 15}, {'c1': 2, 'c2': 100}])
How to sort pandas data frame using values from several columns?