add

python/examples/functional/filter_dictionary.out

@@ -0,0 +1,3 @@
+{'math': 100, 'biology': 53, 'chemistry': 62, 'art': 78, 'history': 20}
+{'math': 100, 'chemistry': 62, 'art': 78}
+{'biology': 53, 'history': 20}

python/examples/functional/filter_dictionary.py

@@ -0,0 +1,18 @@
+def main():
+    grades = {
+        "math":  100,
+        "biology": 53,
+        "chemistry": 62,
+        "art": 78,
+        "history": 20,
+    }
+    print(grades)
+
+    good_grades = {key: value for (key, value) in grades.items() if value >= 60}
+    print(good_grades)
+
+    bad_grades = {key: grades[key] for key in grades if grades[key] < 60}
+    print(bad_grades)
+
+
+main()

python/functional.md

@@ -444,6 +444,15 @@ This can have only one iterable!
 ![](examples/functional/filter_map_one.py)
 ![](examples/functional/filter_map_one.out)
 
+## filter a dictionary using dict comprehension
+{id: filter-a-dictionary}
+
+We have a dictionary, we would like to create another dictionary based on this one that contains only key-value pairs that meet a certain condition.
+
+![](examples/functional/filter_dictionary.py)
+![](examples/functional/filter_dictionary.out)
+
+
 ## Get indices of values
 {id: get-indexes-of-values}