diff --git a/KorAPClient/__init__.py b/KorAPClient/__init__.py
index 77bb10c..14ca5a8 100644
--- a/KorAPClient/__init__.py
+++ b/KorAPClient/__init__.py
@@ -1,7 +1,9 @@
 __pdoc__ = {'tests': False}
 
 import warnings
+from itertools import product
 
+import pandas as pd
 import rpy2.robjects as robjects
 import rpy2.robjects.packages as packages
 import rpy2.robjects.pandas2ri as pandas2ri
@@ -26,6 +28,27 @@
 robjects.conversion.set_conversion(robjects.default_converter + pandas2ri.converter + korapclient_converter)
 
 
+def expand_grid(dictionary):
+    """Create a oandas DataFrame from all combinations of inputs
+
+    - **dictionary** - dict with variable names as  keys and their values as vectors
+
+    Returns:
+        DataFrame with column names as specified by the dictionary key and all combinations of the specified values
+        in the rows.
+
+    Example:
+        ```
+        $ df = expand_grid({"Year": range(2010, 2019), "Country": ["DE", "CH"] })
+
+        $ df["vc"] = "textType=/Zeit.*/ & pubPlaceKey = " + df.Country + " & pubDate in " + list(map(str, df.Year))
+        ```
+    """
+
+    return pd.DataFrame([row for row in product(*dictionary.values())],
+                        columns=dictionary.keys())
+
+
 # noinspection PyPep8Naming
 class KorAPConnection(RS4):
     """Connection to a KorAP server."""
diff --git a/examples/hello_world_interactive.py b/examples/hello_world_interactive.py
index f93e799..9aaa6a2 100755
--- a/examples/hello_world_interactive.py
+++ b/examples/hello_world_interactive.py
@@ -1,14 +1,10 @@
 #!/usr/bin/env python3
 import altair as alt
-import pandas as pd
-from KorAPClient import KorAPClient, KorAPConnection
+from KorAPClient import KorAPClient, KorAPConnection, expand_grid
 
 QUERY = "Hello World"
-YEARS = range(2010, 2019)
-COUNTRIES = ["DE", "CH"]
-
-df = pd.DataFrame(YEARS, columns=["Year"], dtype=str).merge(pd.DataFrame(COUNTRIES, columns=["Country"]), how="cross")
-df["vc"] = "textType=/Zeit.*/ & pubPlaceKey = " + df.Country + " & pubDate in " + df.Year
+df = expand_grid({"Year": range(2010, 2019), "Country": ["DE", "CH"]})
+df["vc"] = "textType=/Zeit.*/ & pubPlaceKey = " + df.Country + " & pubDate in " + list(map(str, df.Year))
 
 kcon = KorAPConnection(verbose=True)