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Minnesota is the “Land of 10,000 Lakes”. But did you know there are more than 10,000 lakes in the state? There are so many lakes that coming up with unique names for the lakes is very difficult! The file mn_lakes.csv (right-click, open in new tab or window) contains a list of Minnesota lakes and some basic data about them. Write a function named most_common_lake_names that takes three arguments: a filename, a minimum acreage (a), and a minimum number (n). Of all lakes of at least a acres, return an array of lake names appearing at least n times. The array should be in alphabetical order, and exclude any unnamed lakes from your analysis. Your function should use pandas operations to do the analysis, and use no loops or list comprehensions. Examples Calling your function with a minimum size of 0 and n = 1 should return all 5,072 unique lake names: In [1]: most_common_lake_names(‘mn_lakes.csv’, 0, 1) Out[1]: array([‘1st Little Gulch’, ‘2nd Little Gulch’, ‘4th Little Gulch’, …, ‘Zumbra-Sunny’, ‘Zumbro’, ‘Zumwalde’], dtype=object) Long Lake, Pelican Lake, Round Lake, and Trout lake are common (3 or more occurrences) among medium-sized (1000 acre or more) lakes: In [2]: most_common_lake_names(‘mn_lakes.csv’, 1000, 3) Out[2]: array([‘Long’, ‘Pelican’, ‘Round’, ‘Trout’], dtype=object) Bass, Cedar, and Clear lakes are among the most common (15 or more occurences) names for lakes of 50 acres or more: In [3]: most_common_lake_names(‘mn_lakes.csv’, 50, 15) Out[3]: array([‘Bass’, ‘Cedar’, ‘Clear’, ‘Crooked’, ‘Eagle’, ‘Fish’, ‘Goose’, ‘Horseshoe’, ‘Island’, ‘Johnson’, ‘Long’, ‘Loon’, ‘Mary’, ‘Moose’, ‘Mud’, ‘Perch’, ‘Pickerel’, ‘Pine’, ‘Rice’, ‘Round’, ‘Sand’, ‘Silver’, ‘Swan’, ‘Tamarack’, ‘Twin’, ‘Wolf’], dtype=object) Lake of the Woods, Leech, Mille Lacs, Rainy, Red, Superior, Vermilion, and Winnibigoshish are among Minnesota’s largest and most famous lakes. However, none of these names appear more than once among very large (30,000 acre or more) lakes: In [4]: most_common_lake_names(‘mn_lakes.csv’, 30000, 1) Out[4]: array([‘Lake of the Woods (MN)’, ‘Leech’, ‘Mille Lacs’, ‘Rainy’, ‘Red’, ‘Superior’, ‘Vermilion’, ‘Winnibigoshish’], dtype=object) In [5]: most_common_lake_names(‘mn_lakes.csv’, 30000, 2) Out[5]: array([], dtype=object)

In the highest_scoring_cities example, I concatenated the city and country names to form a new column. I did this to…

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