diff --git a/.flake8 b/.flake8
new file mode 100644
index 0000000..c5c58a1
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,4 @@
+[flake8]
+per-file-ignores =
+    # line too long
+    tests/test_ibw.py: E501,
diff --git a/tests/helper.py b/tests/helper.py
index 1988194..4b08d5b 100644
--- a/tests/helper.py
+++ b/tests/helper.py
@@ -1,14 +1,16 @@
 import pathlib
 import numpy as _numpy
-from pprint import pformat, PrettyPrinter
+from pprint import PrettyPrinter
 from igor2.binarywave import load as loadibw
 
 data_dir = pathlib.Path(__file__).parent / "data"
 
+
 class NumpyPrettyPrinter(PrettyPrinter):
     def format(self, object, context, maxlevels, level):
         if isinstance(object, _numpy.ndarray):
-            # Generate the entire array string using numpy's own mechanism but ensuring dtype is displayed
+            # Generate the entire array string using numpy's own mechanism but
+            # ensuring dtype is displayed
             array_repr = _numpy.array2string(object, separator=', ')
             # Append dtype only once for the whole array
             formatted_array = f"array({array_repr}, dtype='{object.dtype}')"
@@ -18,11 +20,11 @@ def format(self, object, context, maxlevels, level):
 
 
 def custom_pformat(object, indent=1, width=80, depth=None, *, compact=False):
-    printer = NumpyPrettyPrinter(indent=indent, width=width, depth=depth, compact=compact)
+    printer = NumpyPrettyPrinter(
+        indent=indent, width=width, depth=depth, compact=compact)
     return printer.pformat(object)
 
 
-
 def assert_equal_dump_no_whitespace_no_byte(data_a, data_b):
     def repl(x):
         for old, new in [