Merge pull request #57 from mattveraldi/fix-keys_only

Solved issue #53

contributor_database

@@ -25,6 +25,6 @@ insertion_sort:[Meet Zaveri](@meetzaveri),[Rohit Tanwar](@kriadmin)
 difference_by:[Rohit Tanwar](@kriadmin)
 bubble_sort: [Shobhit Sachan](@sachans)
 has_duplicates: [Rob-Rychs](@Rob-Rychs)
-keys_only: [Rob-Rychs](@Rob-Rychs)
+keys_only: [Rob-Rychs](@Rob-Rychs),[Matteo Veraldi](@mattveraldi)
 values_only: [Rob-Rychs](@Rob-Rychs)
 all_unique: [Rob-Rychs](@Rob-Rychs)

snippets/keys_only.md

@@ -2,14 +2,11 @@
 
 Function which accepts a dictionary of key value pairs and returns a new flat list of only the keys.
 
-Uses the .items() function with a for loop on the dictionary to track both the key and value and returns a new list by appending the keys to it. Best used on 1 level-deep key:value pair dictionaries (a flat dictionary) and not nested data-structures which are also commonly used with dictionaries. (a flat dictionary resembles a json and a flat list an array for javascript people).
+Uses the .keys() method of "dict" objects. dict.keys() returns a view object that displays a list of all the keys. Then, list(dict.keys()) returns a list that stores all the keys of a dict.
 
 ``` python
 def keys_only(flat_dict):
-    lst = []
-    for k, v in flat_dict.items():
-        lst.append(k)
-    return lst
+    return list(flat_dict.keys())
 ```
 
 ``` python

test/keys_only/keys_only.py

@@ -1,5 +1,2 @@
 def keys_only(flat_dict):
-    lst = []
-    for k, v in flat_dict.items():
-        lst.append(k)
-    return lst
+    return list(flat_dict.keys())