diff --git a/data.py b/data.py
index a3e2052..e644ffb 100644
--- a/data.py
+++ b/data.py
@@ -1,4 +1,4 @@
-from colours import *
+from colours import DARK, BOLD, DARK_GRAY, YELLOW, RED, WHITE
 from console import supported_chars
 
 
diff --git a/events.py b/events.py
index aacc5b2..51915ad 100644
--- a/events.py
+++ b/events.py
@@ -40,4 +40,4 @@ def boom(server, x, y):
 
     server.splash_damage(x, y, radius*2, blast_strength/3)
 
-    return new_blocks
\ No newline at end of file
+    return new_blocks
diff --git a/items.py b/items.py
index 2d7f0bf..4bd1498 100644
--- a/items.py
+++ b/items.py
@@ -66,4 +66,4 @@ def items_to_render_objects(items, x, offset):
 
         objects.append(object_)
 
-    return objects
\ No newline at end of file
+    return objects
diff --git a/main.py b/main.py
index 672af71..013a5f7 100644
--- a/main.py
+++ b/main.py
@@ -80,7 +80,6 @@ def setdown():
 
 def game(server, settings, benchmarks):
     dt = 0  # Tick
-    df = 0  # Frame
     dc = 0  # Cursor
     ds = 0  # Selector
     dpos = False
@@ -286,14 +285,14 @@ def game(server, settings, benchmarks):
             events += new_events
 
             new_blocks = {}
-            for i in range(int(dt)):
+            for _ in range(int(dt)):
                 new_blocks.update(process_events(events, server))
             if new_blocks:
                 server.set_blocks(new_blocks)
 
             # If no block below, kill player
             try:
-                block = server.map_[x][y+1]
+                _ = server.map_[x][y+1]
             except IndexError:
                 alive = False
 
diff --git a/mobs.py b/mobs.py
index 74607ab..cde2343 100644
--- a/mobs.py
+++ b/mobs.py
@@ -30,7 +30,7 @@ def update(mobs, players, map_, last_tick):
     new_items = {}
 
     for mob_id, mob in mobs.items():
-        mx, my, x_vel = mob['x'], mob['y'], mob['x_vel']
+        mx, my = mob['x'], mob['y']
 
         if mob['health'] <= 0:
             removed_mobs.append(mob_id)
@@ -64,7 +64,7 @@ def update(mobs, players, map_, last_tick):
 
 
 def spawn(mobs, players, map_, x_start_range, y_start_range, x_end_range, y_end_range):
-    log("spawning", x_start_range, x_end_range, m='mobs');
+    log('spawning', x_start_range, x_end_range, m='mobs')
 
     n_mobs_to_spawn = random.randint(0, 5) if random.random() < mob_rate else 0
     new_mobs = {}
diff --git a/network.py b/network.py
index e428e86..33918ca 100644
--- a/network.py
+++ b/network.py
@@ -53,7 +53,7 @@ def receive(sock):
         d = bytes()
 
         try:
-            for i in range(length // bufsize):
+            for _ in range(length // bufsize):
                 d += sock.recv(bufsize)
                 time.sleep(0.001)
             d += sock.recv(length % bufsize)
@@ -107,7 +107,7 @@ def start(data_handler, port):
     HOST, PORT = '0.0.0.0', int(port)
 
     server = ThreadedTCPServer((HOST, PORT), requestHandlerFactory(data_handler))
-    ip, port = server.server_address
+    _, port = server.server_address
 
     # Start a thread with the server -- that thread will then start one
     # more thread for each request
diff --git a/pathfinding.py b/pathfinding.py
index f8c39d5..8440ed4 100644
--- a/pathfinding.py
+++ b/pathfinding.py
@@ -33,4 +33,4 @@ def pathfind_towards_delta(entity, delta, map_):
 
       updated = True
 
-  return updated, kill_entity
\ No newline at end of file
+  return updated, kill_entity
diff --git a/player.py b/player.py
index f3ee45b..ac0da3a 100644
--- a/player.py
+++ b/player.py
@@ -44,7 +44,7 @@ def get_pos_delta_on_input(inp, map_, x, y, jump, flight):
     return dx, dy, jump
 
 
-def get_pos_delta(dx, x, y, map_, flight):
+def get_pos_delta(dx, x, y, map_, flight=False):
 
     player_slice = map_[x]
 
diff --git a/render.py b/render.py
index 0ddc95d..f3d28bf 100644
--- a/render.py
+++ b/render.py
@@ -1,7 +1,7 @@
 from math import pi, cos, sin, sqrt, modf, radians
 
-from colours import *
-from console import *
+from colours import colour_str, uncolour_str, rgb, round_to_palette, lightness, bold, RED, CYAN, BLUE
+from console import supported_chars, DEBUG, POS_STR, CLS_END_LN
 from data import lighting, world_gen, blocks, timings
 from terrain import is_solid
 
@@ -104,7 +104,6 @@ def obj_pixel(x, y, objects):
 
     if object_:
         model = object_['model']
-        width = len(model)
         height = len(model[0])
 
         dx = x - object_['x']
@@ -240,7 +239,7 @@ def get_light_colour(x, y, world_x, map_, slice_heights, lights, colour_behind,
 
         else:
 
-            light = CYAN if any(map(lambda l: lit(world_x, x, y, l) < 1, lights)) else hsv_to_rgb(colour_behind)
+            light = CYAN if any(map(lambda l: lit(world_x + x, y, l) < 1, lights)) else hsv_to_rgb(colour_behind)
 
     return light
 
diff --git a/render_interface.py b/render_interface.py
index 8c938c9..9d11482 100644
--- a/render_interface.py
+++ b/render_interface.py
@@ -55,4 +55,4 @@ def get_light_level(*args):
         log('Not implemented: Python get_light_level function', m='warning')
 
     log('{}'.format(result), m='lighting')
-    return result
\ No newline at end of file
+    return result
diff --git a/server.py b/server.py
index e7fdb9d..c45f2c5 100644
--- a/server.py
+++ b/server.py
@@ -322,7 +322,7 @@ def spawn_mobs(self, n_mob_spawn_cycles, bk_objects, sky_colour, day, lights):
 
                 render_interface.create_lighting_buffer(width, height, x_start, y_start, self._map, self._slice_heights, bk_objects, sky_colour, day, lights)
 
-                for i in range(n_mob_spawn_cycles):
+                for _ in range(n_mob_spawn_cycles):
                     mobs.spawn(self._meta['mobs'], self._meta['players'], self._map, x_start, y_start, x_end, y_end)
 
     def update_items(self):
diff --git a/server_interface.py b/server_interface.py
index 39b6938..f413ca7 100644
--- a/server_interface.py
+++ b/server_interface.py
@@ -337,15 +337,13 @@ def _event_logout(self, error=None):
         self.game = False
 
     def _event_error(self, error):
-        self.error = 'Error from server: ' + error['event'] + ': ' + event['message']
+        self.error = 'Error from server: ' + error['event'] + ': ' + error['message']
         log(self.error)
         self.game = False
 
     # Main loop methods:
 
     def get_chunks(self, chunk_list):
-        slices_its_loading = ((chunk_num + chunk * chunk_size) for chunk in chunk_list for chunk_num in range(chunk_size))
-
         self.handle(self._send('get_chunks', [chunk_list]))
         self.view_change = True
 
diff --git a/terrain_gen.py b/terrain_gen.py
index 1d42124..31a6915 100644
--- a/terrain_gen.py
+++ b/terrain_gen.py
@@ -26,7 +26,7 @@ class TerrainCache(OrderedDict):
         Beyond which it replaces the oldest item. """
 
     def __init__(self, *args, **kwds):
-        self._limit = kwds.pop("limit", None)
+        self._limit = kwds.pop('limit', None)
         OrderedDict.__init__(self, *args, **kwds)
         self._check_limit()
 
@@ -81,7 +81,7 @@ def gen_hill_chunk_features(chunk_pos, chunk_features_in_range, seed):
 def gen_biome_slice_features(x, chunk_features_in_range, slice_features, seed):
 
     slice_biome = ('normal', None)
-    slice_biome_distance_to_centre = float("inf")
+    slice_biome_distance_to_centre = float('inf')
 
     if chunk_features_in_range.get('biomes') is not None:
         for biome in chunk_features_in_range.get('biomes'):
@@ -248,7 +248,7 @@ def gen_cave_features(features, chunk_pos, meta):
 
     if features[chunk_pos].get('cave') is None:
         # Perform cellular automata
-        for i in range(ca_iterations):
+        for _ in range(ca_iterations):
             new_air_points = set()
 
             for x in range(air_points_x_min, air_points_x_max):
@@ -274,7 +274,6 @@ def generate_slice_features(features, chunk_pos, meta, feature_generator, featur
     log("generate_slice_features range", chunk_pos - feature_buffer[0], chunk_pos + world_gen['chunk_size'] + feature_buffer[1], m=1)
 
     # Generate dictionary of chunk-features (features on chunk positions) within the feature_buffer range.
-    chunk_n = ceil(chunk_pos / world_gen['chunk_size'])
     feature_buffer_chunk = (ceil(feature_buffer[0] / world_gen['chunk_size']) * world_gen['chunk_size'],
                             ceil(feature_buffer[1] / world_gen['chunk_size']) * world_gen['chunk_size'])
     feature_buffer_range = range(chunk_pos - feature_buffer_chunk[0],
@@ -283,8 +282,6 @@ def generate_slice_features(features, chunk_pos, meta, feature_generator, featur
 
     for x in range(chunk_pos - feature_buffer[0], chunk_pos + world_gen['chunk_size'] + feature_buffer[1]):
 
-        slice_chunk_pos = (x // world_gen['chunk_size']) * world_gen['chunk_size']
-
         if features.get(x) is None:
             # Init to empty, so 'no features' is cached.
             features[x] = {}
@@ -339,4 +336,4 @@ def gen_chunk_features(chunk_n, meta):
     generate_slice_features(FEATURES, chunk_pos, meta, gen_grass_features, 'grass', (0, 0))
     generate_slice_features(FEATURES, chunk_pos, meta, gen_ore_features, 'ores', MAX_ORE_RANGE)
 
-    return FEATURES
\ No newline at end of file
+    return FEATURES
diff --git a/translate_data.py b/translate_data.py
index ed6da4b..68124af 100644
--- a/translate_data.py
+++ b/translate_data.py
@@ -72,4 +72,4 @@ def main():
 
 
 if __name__ == '__main__':
-	main()
\ No newline at end of file
+	main()
diff --git a/ui.py b/ui.py
index c8f9e08..0fe36dc 100644
--- a/ui.py
+++ b/ui.py
@@ -1,7 +1,6 @@
 from nbinput import BlockingInput, UP, DOWN, RIGHT, LEFT
 from console import CLS, REDRAW, WIDTH, HEIGHT, SHOW_CUR, HIDE_CUR
-from colours import *
-from console import *
+from colours import colour_str, TERM_YELLOW, TERM_RED, BOLD
 from data import help_data
 
 import saves