Checkpoint 1 commit 2: Wrote get_email.

I got stuck with this in a couple places. The first was just getting
used to the syntax. The second was that I wasn't sure of the
difference between is and ==. Similar to before, I just tested
the specific function in friend_functions.py using the test cases
given and checked what output I was actually getting to figure out
what it was doing, which wasn't always obvious when running
test_friend_functions.py

friend_functions.py

@@ -9,6 +9,8 @@
 # Your job is to complete these functions. Remove the NotImplementedError from
 # each and instead write code which returns the expected values. 
 
+from people import friends, family
+
 def count_people(people):
     """Counts the number of people. 
     
@@ -23,14 +25,9 @@ def count_people(people):
     return counted
 
 def get_email(people, name):
-    """Returns the named person's email address. If there is no such person, returns None.
-
-        >>> get_email(family, "Tad Winters")
-        "ligula.aenean@hotmail.edu"
-        >>> get_email(friends, "Tad Winters")
-        None
-    """
-    raise NotImplementedError()
+    for person in people:
+        if person["name"] == name:
+            return person["email"]
 
 def count_favorite_colors(people, name):
     """Returns the number of colors liked by the named person. If there is no such person, returns None.