Update README.md

README.md

@@ -157,6 +157,18 @@ for example in dataset:
 }
 ```
 
+You can use this little helper to unflatten sequences:
+```python
+def revert_flattening(records):
+    fixed_records = []
+    for key, values in records.items():
+        if not fixed_records:
+            fixed_records = [{} for _ in range(len(values))]
+        for i, value in enumerate(values):
+            fixed_records[i][key] = value
+    return fixed_records
+```
+
 ## Source Data
 
 * The data source is the [Russian StackOverflow](https://ru.stackoverflow.com/) website.