diff --git a/obstools/__init__.py b/obstools/__init__.py
index e84a32b..c2af11c 100644
--- a/obstools/__init__.py
+++ b/obstools/__init__.py
@@ -8,8 +8,7 @@
 #
 #  @author: tbowers
 
-"""Init File
-"""
+"""Init File"""
 
 
 # Imports for signal and log handling
diff --git a/obstools/neocp_ephem.py b/obstools/neocp_ephem.py
index a90bf77..29c4d67 100644
--- a/obstools/neocp_ephem.py
+++ b/obstools/neocp_ephem.py
@@ -87,7 +87,7 @@
 .. warning::
 
     This module is not yet functional!
-    
+
 """
 
 # Built-In Libraries
diff --git a/obstools/scrub_deveny_pickup.py b/obstools/scrub_deveny_pickup.py
index 348bc06..288a2b6 100644
--- a/obstools/scrub_deveny_pickup.py
+++ b/obstools/scrub_deveny_pickup.py
@@ -60,6 +60,7 @@
 import ccdproc.utils.slices
 import matplotlib.pyplot as plt
 import numpy as np
+
 # from pypeit import msgs
 import pypeit.spec2dobj
 import scipy.fft
@@ -1012,7 +1013,9 @@ def package_into_fits(
         suffix  (Default: False)
     """
     # Add a little history
-    time_str = datetime.datetime.now(datetime.UTC).isoformat(sep=" ", timespec="seconds")
+    time_str = datetime.datetime.now(datetime.UTC).isoformat(
+        sep=" ", timespec="seconds"
+    )
     history_str = f"Written by package obstools: {time_str} UTC"
     # For the image HDUs, include a basic header
     img_hdr = astropy.io.fits.Header({"BUNIT": "ADU", "HISTORY": history_str})
diff --git a/obstools/tests/test_celestial_time.py b/obstools/tests/test_celestial_time.py
index 2f712aa..d508107 100644
--- a/obstools/tests/test_celestial_time.py
+++ b/obstools/tests/test_celestial_time.py
@@ -11,8 +11,7 @@
 #  @author: tbowers
 # pylint: disable=missing-function-docstring
 
-"""Celestial Time Utilities TEST Module
-"""
+"""Celestial Time Utilities TEST Module"""
 
 import numpy as np
 import pytest
diff --git a/obstools/tests/test_deveny_grangle.py b/obstools/tests/test_deveny_grangle.py
index 5dbdb6f..3206cf7 100644
--- a/obstools/tests/test_deveny_grangle.py
+++ b/obstools/tests/test_deveny_grangle.py
@@ -11,8 +11,7 @@
 #  @author: tbowers
 # pylint: disable=missing-function-docstring
 
-"""DeVeny Grating Angle Calculator TEST Module
-"""
+"""DeVeny Grating Angle Calculator TEST Module"""
 
 import numpy as np
 
diff --git a/obstools/tests/test_lmi_etc.py b/obstools/tests/test_lmi_etc.py
index 66d4722..8d24c67 100644
--- a/obstools/tests/test_lmi_etc.py
+++ b/obstools/tests/test_lmi_etc.py
@@ -11,8 +11,7 @@
 #  @author: tbowers
 # pylint: disable=missing-function-docstring
 
-"""LMI Exposure Time Calculator TEST Module
-"""
+"""LMI Exposure Time Calculator TEST Module"""
 
 import numpy as np
 import pytest
diff --git a/obstools/tests/test_utils.py b/obstools/tests/test_utils.py
index 52b18b0..ebd1677 100644
--- a/obstools/tests/test_utils.py
+++ b/obstools/tests/test_utils.py
@@ -11,8 +11,7 @@
 #  @author: tbowers
 # pylint: disable=missing-function-docstring
 
-"""Utility TEST Module
-"""
+"""Utility TEST Module"""
 
 from obstools import utils
 
@@ -40,6 +39,12 @@ def test_flatten_comprehension():
     pass
 
 
+def test_flatten_itertools():
+    nested_str = [["a", "b", "c"], ["d"], ["e"], ["f"], ["g"]]
+    flat_str = utils.flatten_itertools(nested_str)
+    assert flat_str == ["a", "b", "c", "d", "e", "f", "g"]
+    # Add other types of tests here...
+
 def test_gaussfit():
     pass
 
diff --git a/obstools/utils.py b/obstools/utils.py
index 8cca85d..7c8227c 100644
--- a/obstools/utils.py
+++ b/obstools/utils.py
@@ -153,7 +153,7 @@ def flatten_itertools(nested_list: list[list]) -> list:
     :obj:`list`
         The flattened list
     """
-    return [itertools.chain.from_iterable(nested_list)]
+    return [item for item in itertools.chain.from_iterable(nested_list)]
 
 
 def gaussfit(