Homework Solutions: Added Comprehension Expressions

group.json

@@ -0,0 +1 @@
+{"Jill": {"age": 26, "job": "biologist", "connections": {"Zalika": "friend", "John": "partner"}}, "Zalika": {"age": 28, "job": "artist", "connections": {"Jill": "friend"}}, "John": {"age": 27, "job": "writer", "connections": {"Jill": "partner", "Nash": "cousin"}}, "Nash": {"age": 34, "job": "chef", "connections": {"John": "cousin", "Zalika": "landord"}}}

group.py

@@ -1,5 +1,84 @@
 """An example of how to represent a group of acquaintances in Python."""
 
+# use dictionaries 
+# use lists
+
+#person keys: name, age, job, connections to others
+
+
+    #Jill is 26, a biologist and she is Zalika's friend and John's partner.
+    #Zalika is 28, an artist, and Jill's friend
+    #John is 27, a writer, and Jill's partner.
+    #Nash is 34, a chef, John's cousin and Zalika's landlord.
+
+#should allow people to have no job
+#should allow people to have no connections
+#reciprocal connections?
+
 # Your code to go here...
 
-my_group =
+my_group = {
+    'Jill': {
+        'age': 26,
+        'job': 'biologist',
+        'connections': {
+            'Zalika': 'friend',
+            'John': 'partner',
+        }
+    },
+
+    'Zalika': {
+        'age': 28,
+        'job': 'artist',
+        'connections': {
+            'Jill': 'friend'
+        }
+    },
+
+    'John': {
+        'age': 27,
+        'job': 'writer',
+        'connections': {
+            'Jill': 'partner',
+            'Nash': 'cousin'
+        }
+    },
+
+    'Nash': {
+        'age': 34,
+        'job': 'chef',
+        'connections': {
+            'John': 'cousin',
+            'Zalika': 'landord'
+        }
+    }
+}
+
+
+# function to compute mean of non-empty list of numbers
+def mean(data):
+    return sum(data)/len(data)
+
+# max age of people in group
+print(max(person['age'] for person in my_group.values()))   #34
+
+# average number of relations among members of the group
+print(mean([len(person['connections'])for person in my_group.values()]))    #1.75
+
+# max age of people in the group that have min 1 relation
+print(max(person['age'] for person in my_group.values() if person['connections']))  #34
+
+# max age of people in group with min 1 friend
+print(max(person['age'] for person in my_group.values() if 'friend' in person['connections'].values())) #28
+
+## saving group dictionary as JSON file
+
+import json
+
+with open('group.json', 'w') as json_group_out:
+    json_group_out.write(json.dumps(my_group))
+
+with open('group.json') as json_group_in:
+    group_again = json.load(json_group_in)
+
+print(group_again)