diff --git a/pyproject.toml b/pyproject.toml
index 1888a9c..bd4d253 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,4 +39,5 @@ line-length = 100
 
 [tool.isort]
 profile = "black"
+skip = ["__init__.py"]
 
diff --git a/src/scgenerator/__init__.py b/src/scgenerator/__init__.py
index 25c6f0b..eb39f01 100644
--- a/src/scgenerator/__init__.py
+++ b/src/scgenerator/__init__.py
@@ -1,11 +1,12 @@
 # ruff: noqa
-from scgenerator import io, math, noise, operators, plotting
+from scgenerator import math
+from scgenerator.physics import units
+from scgenerator import io, noise, operators, plotting
 from scgenerator.helpers import *
-from scgenerator.io import MemoryIOHandler, ZipFileIOHandler
 from scgenerator.logger import get_logger
 from scgenerator.math import abs2, argclosest, normalized, span, tspace, wspace
 from scgenerator.parameter import Parameters
-from scgenerator.physics import fiber, materials, plasma, pulse, units
+from scgenerator.spectra import Spectrum, propagation
+from scgenerator.physics import fiber, materials, plasma, pulse
 from scgenerator.physics.units import PlotRange
 from scgenerator.solver import SimulationResult, integrate, solve43
-from scgenerator.spectra import Spectrum, propagation