added answers for PYTHON Sets exercises

Author: alexoah

W3School-PyExercises/PY-Sets/pySetsE1.py

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+"""
+from PYTHON Sets: Exercise 1 ( https://www.w3schools.com/python/exercise.asp?filename=exercise_sets1 )
+
+question:
+    Check if "apple" is present in the fruits set.
+
+    fruits = {"apple", "banana", "cherry"}
+    if "apple" __ fruits:
+        print("Yes, apple is a fruit!")
+"""
+fruits = {"apple", "banana", "cherry"}
+if "apple" in fruits:
+    print("Yes, apple is a fruit!")

W3School-PyExercises/PY-Sets/pySetsE2.py

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+"""
+from PYTHON Sets: Exercise 2 ( https://www.w3schools.com/python/exercise.asp?filename=exercise_sets2 )
+
+question:
+    Use the add method to add "orange" to the fruits set.
+
+    fruits = {"apple", "banana", "cherry"}
+    ____________________
+"""
+fruits = {"apple", "banana", "cherry"}
+fruits.add("orange")

W3School-PyExercises/PY-Sets/pySetsE3.py

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+"""
+from PYTHON Sets: Exercise 3 ( https://www.w3schools.com/python/exercise.asp?filename=exercise_sets3 )
+
+question:
+    Use the correct method to add multiple items (more_fruits) to the fruits set.
+
+    fruits = {"apple", "banana", "cherry"}
+    more_fruits = ["orange", "mango", "grapes"]
+    __________________________
+"""
+fruits = {"apple", "banana", "cherry"}
+more_fruits = ["orange", "mango", "grapes"]
+fruits.update(more_fruits)

W3School-PyExercises/PY-Sets/pySetsE4.py

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+"""
+from PYTHON Sets: Exercise 4 ( https://www.w3schools.com/python/exercise.asp?filename=exercise_sets4 )
+
+question:
+    Use the remove method to remove "banana" from the fruits set.
+
+    fruits = {"apple", "banana", "cherry"}
+    _______________________
+"""
+fruits = {"apple", "banana", "cherry"}
+fruits.remove("banana")

W3School-PyExercises/PY-Sets/pySetsE5.py

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+"""
+from PYTHON Sets: Exercise 5 ( https://www.w3schools.com/python/exercise.asp?filename=exercise_sets5 )
+
+question:
+    Use the discard method to remove "banana" from the fruits set.
+
+    fruits = {"apple", "banana", "cherry"}
+    ________________________
+"""
+fruits = {"apple", "banana", "cherry"}
+fruits.discard("banana")