If people chose a number between 0 and Infinity truly at random, we would not expect a sample of a couple hundred people to frequently choose the same number. Let's write a function to start to assess randomness in human choice. Define a function called calculate_unique . Inputs: data - DataFrame • variable - name of column in data to summarize (string) Output: • num_unique, num_total, num_unique/num_total Procedure: 1. Calculate the number of unique responses in the specified variable of the input DataFrame. Store this in num_unique. (Hint: there is a unique() method in pandas) 2. Calculate the number of total responses. Store this in num_total 3. Return, num_unique, num_total, and the proportion of unique responses ( num_unique/num_total)- Return all three, separated by commas, in the return statement. : def calculate_unique(data, variable): : assert callable(calculate_unique) : test_df = pd.DataFrame ( {'ID' : [1, 2, 3], 'response' : ['a', 'a', 'b']}) num_unique, num_total, prop_unique = calculate_unique (test_df, 'response') assert (num_unique == 2) assert(num_total == 3)

13. While dictionaries are designed so that we can find a value based on a key, every so often we need to perform a reverse lookup. For example, imagine a dictionary where the keys are names and the values are phone numbers. Usually we want to find the phone number based on the name, but occasionally you might need to find a name based on the phone number. Write a function called reverse_lookup(dictionary, value) that returns all the keys in the dictionary associated with the specified value. Note: In dictionaries, the keys are guaranteed to be unique, but the values are not. So your function should return a list containing all of the matching keys (if any) Example: Given this dictionary, groups = {'Apple': 'Fruit', 'Spinach': 'Vegetable', 'Banana': 'Fruit'} reverse_lookup (groups. Vegetable') ["Spinach'] reverse_lookup (groups, Fruit') ['Apple'. 'Banana'] reverse_lookup (groups. 'Meat') []

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How does the Use of LOOKUP function to get the directory of a store, be useful and applicable in business and other transactions?