Initial setup

.gitignore

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+.cache
+.coverage

datastats/datastats.py

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+import math
+import json
+
+
+class DataStats:
+
+    def stats(self, data, iage, isalary):
+        # iage and isalary are the starting age and salary used to
+        # compute the average yearly increase of salary.
+
+        # Compute average yearly increase
+        average_age_increase = math.floor(
+            sum([e['age'] for e in data])/len(data)) - iage
+        average_salary_increase = math.floor(
+            sum([int(e['salary'][1:]) for e in data])/len(data)) - isalary
+
+        yearly_avg_increase = math.floor(
+            average_salary_increase/average_age_increase)
+
+        # Compute max salary
+        salaries = [int(e['salary'][1:]) for e in data]
+        threshold = '£' + str(max(salaries))
+
+        max_salary = [e for e in data if e['salary'] == threshold]
+
+        # Compute min salary
+        salaries = [int(d['salary'][1:]) for d in data]
+        min_salary = [e for e in data if e['salary'] ==
+                      '£{}'.format(str(min(salaries)))]
+
+        return json.dumps({
+            'avg_age': math.floor(sum([e['age'] for e in data])/len(data)),
+            'avg_salary': math.floor(sum(
+                [int(e['salary'][1:]) for e in data])/len(data)),
+            'avg_yearly_increase': yearly_avg_increase,
+            'max_salary': max_salary,
+            'min_salary': min_salary
+        })

pytest.ini

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+[pytest]
+minversion   = 2.0
+norecursedirs= .git .tox venv* requirements*
+python_files = test*.py

requirements.txt

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+coverage==4.4.1
+py==1.4.34
+pytest==3.1.2
+pytest-cov==2.5.1