diff --git a/src/escpos/printer/__init__.py b/src/escpos/printer/__init__.py
index 50a73a2..760352a 100644
--- a/src/escpos/printer/__init__.py
+++ b/src/escpos/printer/__init__.py
@@ -1,17 +1,15 @@
 # -*- coding: utf-8 -*-
 """printer implementations."""
 
-from .lp import LP
-from .dummy import Dummy
-from .file import File
-from .network import Network
-from .serial import Serial
-
 # from .win32raw import Win32Raw
 from .cups import CupsPrinter
+from .dummy import Dummy
+from .file import File
+from .lp import LP
+from .network import Network
+from .serial import Serial
 from .usb import Usb
 
-
 __all__ = [
     "Usb",
     "File",
diff --git a/src/escpos/printer/lp.py b/src/escpos/printer/lp.py
index 70d8295..ae20e8f 100644
--- a/src/escpos/printer/lp.py
+++ b/src/escpos/printer/lp.py
@@ -8,13 +8,11 @@
 :license: MIT
 """
 
-from ..escpos import Escpos
-
-
 import os
-import sys
 import subprocess
+import sys
 
+from ..escpos import Escpos
 
 if not sys.platform.startswith("win"):
 
diff --git a/src/escpos/printer/network.py b/src/escpos/printer/network.py
index 0b854ec..2dadc2d 100644
--- a/src/escpos/printer/network.py
+++ b/src/escpos/printer/network.py
@@ -8,10 +8,10 @@
 :license: MIT
 """
 
-from ..escpos import Escpos
-
 import socket
 
+from ..escpos import Escpos
+
 
 class Network(Escpos):
     """Network printer.
diff --git a/src/escpos/printer/serial.py b/src/escpos/printer/serial.py
index 72e3265..e2bc342 100644
--- a/src/escpos/printer/serial.py
+++ b/src/escpos/printer/serial.py
@@ -8,10 +8,10 @@
 :license: MIT
 """
 
-from ..escpos import Escpos
-
 import serial
 
+from ..escpos import Escpos
+
 
 class Serial(Escpos):
     """Serial printer.