fix #results in examples, added test file for keys_only

snippets/all_unique.md

@@ -11,6 +11,7 @@ def all_unique(lst):
 
 ``` python
 x = [1,2,3,4,5,6]
-all_unique(x) # result
-True
+y = [1,2,2,3,4,5]
+all_unique(x) # True
+all_unique(y) # False
 ```

snippets/has_duplicates.md

@@ -11,6 +11,7 @@ def has_duplicates(lst):
 
 ``` python
 x = [1,2,3,4,5,5]
-has_duplicates(x) # result
-True
+y = [1,2,3,4,5]
+has_duplicates(x) # True
+has_duplicates(y) # False
 ```

snippets/keys_only.md

@@ -18,6 +18,5 @@ ages = {
      "Isabel": 11,
      "Anna": 9,
 }
-keys_only(ages) # result
-['Peter', 'Isabel', 'Anna']
+keys_only(ages) # ['Peter', 'Isabel', 'Anna']
 ```

snippets/values_only.md

@@ -18,6 +18,5 @@ ages = {
      "Isabel": 11,
      "Anna": 9,
 }
-values_only(ages) # result
-[10, 11, 9]
+values_only(ages) # [10, 11, 9]
 ```