Adding solution in episode 02

_episodes/02-short-introduction-to-Python.md

@@ -367,6 +367,15 @@ a_list = [1, 2, 3]
 > 4. What information does the built-in function `len()` provide?
      Does it provide the same information on both tuples and lists?
      Does the `help()` function confirm this?
+>
+> > ## Solution
+> > ~~~
+> > 1. The second value in a_list is replaced with 5.
+> > 2. There is an error: TypeError: 'tuple' object does not support item assignment; As a tuple is immutable, it does not support item assignment. Elements in a list can be altered individually.
+> > 3. `<class 'tuple'>`; The function tells you that the variable *a_tuple* is an object of the class *tuple*.
+> > 4. len() tells us the length of an object. It works the same for both lists and tuples, providing us with the number of entries in each case.
+> > ~~~
+> {: .solution}
 {: .challenge}