diff --git a/exhibit/core/generate/continuous.py b/exhibit/core/generate/continuous.py
index 61b7b17..a2f8269 100644
--- a/exhibit/core/generate/continuous.py
+++ b/exhibit/core/generate/continuous.py
@@ -3,7 +3,6 @@
 '''
 
 # Standard library imports
-import re
 
 # External library imports
 import numpy as np
diff --git a/exhibit/core/generate/derived.py b/exhibit/core/generate/derived.py
index 1f53b3b..5a49160 100644
--- a/exhibit/core/generate/derived.py
+++ b/exhibit/core/generate/derived.py
@@ -4,8 +4,6 @@
 
 # Standard library imports
 import re
-from datetime import time
-from functools import partial
 
 # External library imports
 import numpy as np
diff --git a/exhibit/core/generate/tests/test_continuous.py b/exhibit/core/generate/tests/test_continuous.py
index 101d330..4da9f27 100644
--- a/exhibit/core/generate/tests/test_continuous.py
+++ b/exhibit/core/generate/tests/test_continuous.py
@@ -9,7 +9,6 @@
 
 # External library imports
 import pandas as pd
-from pandas.testing import assert_series_equal
 import numpy as np
 
 # Module under test
diff --git a/exhibit/core/generate/tests/test_derived.py b/exhibit/core/generate/tests/test_derived.py
index 0764ecb..7b4080b 100644
--- a/exhibit/core/generate/tests/test_derived.py
+++ b/exhibit/core/generate/tests/test_derived.py
@@ -4,7 +4,6 @@
 
 # Standard library imports
 import unittest
-from collections import namedtuple
 
 # External library imports
 import pandas as pd
diff --git a/exhibit/core/generate/uuids.py b/exhibit/core/generate/uuids.py
index 523b366..47779c4 100644
--- a/exhibit/core/generate/uuids.py
+++ b/exhibit/core/generate/uuids.py
@@ -54,6 +54,9 @@ def generate_uuid_column(
 
     for row in freq_df.itertuples():
 
+        # initialise intermediate uuid list
+        _uuids = []
+
         # always round up the number of generated rows before casting to int
         _num_rows = int(np.ceil(
             num_rows * float(row.probability_vector) / int(row.frequency)))
@@ -71,8 +74,6 @@ def generate_uuid_column(
             range_max = range_max + _num_rows
             continue
 
-        _uuids = []
-
         for _ in range(_num_rows):
             _uuids.append(uuid.UUID(int=rng.getrandbits(128), version=4).hex)