diff --git a/roentgen/mapper.py b/roentgen/mapper.py
index 792bda1..a80913e 100644
--- a/roentgen/mapper.py
+++ b/roentgen/mapper.py
@@ -1,7 +1,7 @@
 """
 Simple OpenStreetMap renderer.
 """
-from typing import Any, Dict, Set, Iterator
+from typing import Any, Dict, Iterator, Set
 
 import numpy as np
 import svgwrite
@@ -18,7 +18,7 @@ from roentgen.flinger import Flinger
 from roentgen.icon import ShapeExtractor
 from roentgen.osm_reader import Map, OSMNode
 from roentgen.point import Occupied, Point
-from roentgen.road import RoadPart, Intersection
+from roentgen.road import Intersection, RoadPart
 from roentgen.scheme import Scheme
 
 __author__ = "Sergey Vartanov"
diff --git a/roentgen/road.py b/roentgen/road.py
index 07e0ce9..dbdebaf 100644
--- a/roentgen/road.py
+++ b/roentgen/road.py
@@ -8,8 +8,8 @@ import numpy as np
 import svgwrite
 
 from roentgen.flinger import Flinger
-from roentgen.vector import angle, turn_by_angle, norm, Line
 from roentgen.osm_reader import OSMNode
+from roentgen.vector import Line, angle, norm, turn_by_angle
 
 
 @dataclass
diff --git a/roentgen/server.py b/roentgen/server.py
index 36ac71e..dfb9370 100644
--- a/roentgen/server.py
+++ b/roentgen/server.py
@@ -1,6 +1,5 @@
 import logging
-from http.server import BaseHTTPRequestHandler
-from http.server import HTTPServer
+from http.server import BaseHTTPRequestHandler, HTTPServer
 from pathlib import Path
 from typing import Optional
 
diff --git a/roentgen/tile.py b/roentgen/tile.py
index 1cb2f7a..84fc2d9 100644
--- a/roentgen/tile.py
+++ b/roentgen/tile.py
@@ -7,7 +7,7 @@ import argparse
 import sys
 from dataclasses import dataclass
 from pathlib import Path
-from typing import Tuple, Optional, List
+from typing import List, Optional, Tuple
 
 import numpy as np
 import svgwrite
@@ -15,7 +15,7 @@ import svgwrite
 from roentgen.constructor import Constructor
 from roentgen.flinger import Flinger
 from roentgen.icon import ShapeExtractor
-from roentgen.mapper import TAGS_FILE_NAME, ICONS_FILE_NAME, Painter
+from roentgen.mapper import ICONS_FILE_NAME, Painter, TAGS_FILE_NAME
 from roentgen.osm_getter import get_osm
 from roentgen.osm_reader import Map, OSMReader
 from roentgen.scheme import Scheme
diff --git a/test/test_color.py b/test/test_color.py
index c573885..94e8014 100644
--- a/test/test_color.py
+++ b/test/test_color.py
@@ -3,7 +3,7 @@ Test color functions.
 """
 from colour import Color
 
-from roentgen.color import is_bright, get_gradient_color
+from roentgen.color import get_gradient_color, is_bright
 from roentgen.util import MinMax
 
 __author__ = "Sergey Vartanov"
diff --git a/test/test_direction.py b/test/test_direction.py
index 901833a..63fe63a 100644
--- a/test/test_direction.py
+++ b/test/test_direction.py
@@ -3,7 +3,7 @@ Test direction processing.
 """
 import numpy as np
 
-from roentgen.direction import parse_vector, DirectionSet
+from roentgen.direction import DirectionSet, parse_vector
 
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
diff --git a/test/test_flinger.py b/test/test_flinger.py
index f02c1d5..25ca25c 100644
--- a/test/test_flinger.py
+++ b/test/test_flinger.py
@@ -4,8 +4,7 @@ Test coordinates computation.
 import numpy as np
 
 from roentgen.flinger import (
-    pseudo_mercator,
-    osm_zoom_level_to_pixels_per_meter,
+    osm_zoom_level_to_pixels_per_meter, pseudo_mercator
 )
 
 __author__ = "Sergey Vartanov"
diff --git a/test/test_icons.py b/test/test_icons.py
index 1a2fe4c..36632f5 100644
--- a/test/test_icons.py
+++ b/test/test_icons.py
@@ -2,12 +2,12 @@
 Test icon generation for nodes.
 """
 from pathlib import Path
-from typing import Dict, Tuple, Set
+from typing import Dict, Set, Tuple
 
 import pytest
 
-from roentgen.icon import IconSet
 from roentgen.grid import IconCollection
+from roentgen.icon import IconSet
 from test import SCHEME, SHAPE_EXTRACTOR
 
 __author__ = "Sergey Vartanov"
diff --git a/test/test_osm_reader.py b/test/test_osm_reader.py
index 030500a..f3d6216 100644
--- a/test/test_osm_reader.py
+++ b/test/test_osm_reader.py
@@ -2,6 +2,7 @@
 Test OSM XML parsing.
 """
 import numpy as np
+
 from roentgen.osm_reader import OSMNode, OSMReader, OSMRelation, OSMWay
 
 __author__ = "Sergey Vartanov"
diff --git a/test/test_tag.py b/test/test_tag.py
index 062ed88..eb1d994 100644
--- a/test/test_tag.py
+++ b/test/test_tag.py
@@ -5,7 +5,6 @@ from typing import Optional
 
 from roentgen.osm_reader import Tagged
 
-
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"