Add Lesson 2 Task 5

Lesson_2/task5.py

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+# Lesson 2 Task 5: sort a comma-separated array of numbers, output the smallest and the biggest elements, and the sum of the rest elements
+# Author: Stanislav Mykhailenko
+# License: Unlicense
+
+# Return codes:
+# 0 - OK
+
+def is_float(number):
+	try:
+		float(number)
+	except ValueError:
+		return False
+	return True
+
+list = [element for element in list(dict.fromkeys(input("Enter a comma-separated list: ").split(','))) if is_float(element)] # remove all duplicates and non-number values
+
+if len(list) == 0:
+	print("The list is empty")
+else:
+	list.sort(key = float)
+	print(list)
+
+	print ("The " + ("only" if len(list) == 1 else "smallest") + " element is: " + str(list[0]))
+	list.remove(list[0])
+
+	if len(list) > 0:
+		print ("The biggest element is: " + str(list[-1]))
+		list.remove(list[-1])
+
+		if len(list) > 0:
+			sum = 0
+
+			for elem in list:
+				sum = sum + float(elem)
+			print(sum)