feat(day 56): implement exoplanet detection using luminosity thresholds with unittest coverage

Author: JohnSunny21

FreeCodeCamp/CodingQ/SpaceWeek/SpaceWeek2.py

@@ -0,0 +1,54 @@
+"""
+Space Week Day 2: Exoplanet Search
+For the second day of Space Week, you are given a string where each character represents the luminosity reading of a star. Determine if the readings have detected an exoplanet using the transit method. The transit method is when a planet passes in front of a star, reducing its observed luminosity.
+
+Luminosity readings only comprise of characters 0-9 and A-Z where each reading corresponds to the following numerical values:
+Characters 0-9 correspond to luminosity levels 0-9.
+Characters A-Z correspond to luminosity levels 10-35.
+A star is considered to have an exoplanet if any single reading is less than or equal to 80% of the average of all readings. For example, if the average luminosity of a star is 10, it would be considered to have a exoplanet if any single reading is 8 or less.
+
+"""
+import unittest
+
+class SpaceWeekTest(unittest.TestCase):
+
+    def test1(self):
+        self.assertEqual(has_exoplanet("665544554"),False)
+
+    def test2(self):
+        self.assertEqual(has_exoplanet("FGFFCFFGG"),True)
+
+    def test3(self):
+        self.assertEqual(has_exoplanet("MONOPLONOMONPLNOMPNOMP"),False)
+
+    def test4(self):
+        self.assertEqual(has_exoplanet("FREECODECAMP"),True)
+
+    def test5(self):
+        self.assertEqual(has_exoplanet("9AB98AB9BC98A"),False)
+
+    def test6(self):
+        self.assertEqual(has_exoplanet("ZXXWYZXYWYXZEGZXWYZXYGEE"),True)
+
+
+
+
+def has_exoplanet(readings):
+
+    def char_to_luminus(c):
+        if c.isdigit():
+            return int(c)
+        else:
+            return ord(c.upper()) - ord('A') + 10
+        
+    values = [char_to_luminus(c) for c in readings]
+    average = sum(values) / len(values)
+    threshold = 0.8 * average
+
+    return any( v <= threshold for v in values)
+
+
+if __name__ == "__main__":
+
+    print(has_exoplanet("665544554"))
+    unittest.main()