Add python files

thinkcspy/Chapter-10-Exercises/Python-files/Problem3.py

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+# Runestone.Academy thinkcspy course
+# Chapter 10
+# Problem 3
+
+myList = [76, 92.3, 'hello', True, 4, 76]
+
+# Your code here
+
+myList += ["apple"]
+myList.insert(3, "cat")
+myList.insert(0, 99)
+print(myList)
+
+print(myList.index("hello"))
+print(myList.count(76))
+
+myList.remove(76)
+myList.pop(myList.index(True))
+
+print(myList)