diff --git a/gfxlcd/abstract/chip.py b/gfxlcd/abstract/chip.py
index f034abe..36eb407 100644
--- a/gfxlcd/abstract/chip.py
+++ b/gfxlcd/abstract/chip.py
@@ -1,7 +1,9 @@
+"""Chip interface"""
 import abc
 
 
 class Chip(metaclass=abc.ABCMeta):
+    """Chip class"""
     def __init__(self, width, height, driver, auto_flush):
         self.options = {}
         self._width = width
@@ -31,20 +33,24 @@ class Chip(metaclass=abc.ABCMeta):
 
     @property
     def color(self):
+        """get RGB colour"""
         return self.options['color']
 
     @color.setter
     def color(self, rgb):
+        """set (R, G, B) colour """
         self.options['color'] = {
             'R': rgb[0], 'G': rgb[1], 'B': rgb[2]
         }
 
     @property
     def background_color(self):
+        """get background colour"""
         return self.options['background_color']
 
     @background_color.setter
     def background_color(self, rgb):
+        """set (R, G, B) background colour """
         self.options['background_color'] = {
             'R': rgb[0], 'G': rgb[1], 'B': rgb[2]
         }
@@ -65,31 +71,31 @@ class Chip(metaclass=abc.ABCMeta):
         pass
 
     @abc.abstractmethod
-    def draw_pixel(self, x, y):
+    def draw_pixel(self, pos_x, pos_y):
         """draw a pixel at x,y"""
         pass
 
     @abc.abstractmethod
-    def draw_line(self, x1, y1, x2, y2):
+    def draw_line(self, pos_x1, pos_y1, pos_x2, pos_y2):
         """draw a line from point x1,y1 to x2,y2"""
         pass
 
     @abc.abstractmethod
-    def draw_rect(self, x1, y1, x2, y2):
+    def draw_rect(self, pos_x1, pos_y1, pos_x2, pos_y2):
         """draw a rectangle"""
         pass
 
     @abc.abstractmethod
-    def draw_circle(self, x, y, r):
+    def draw_circle(self, pos_x, pos_y, radius):
         """draw a circle"""
         pass
 
     @abc.abstractmethod
-    def draw_arc(self, x, y, radius, start, end):
+    def draw_arc(self, pos_x, pos_y, radius, start, end):
         """draw an arc"""
         pass
 
     @abc.abstractmethod
-    def fill_rect(self, x1, y1, x2, y2):
+    def fill_rect(self, pos_x1, pos_y1, pos_x2, pos_y2):
         """draw a filled rectangle"""
         pass
diff --git a/gfxlcd/abstract/driver.py b/gfxlcd/abstract/driver.py
index f868593..07876b6 100644
--- a/gfxlcd/abstract/driver.py
+++ b/gfxlcd/abstract/driver.py
@@ -3,6 +3,7 @@ import abc
 
 
 class Driver(metaclass=abc.ABCMeta):
+    """Driver interface"""
     @abc.abstractmethod
     def init(self):
         """initialize a device"""
diff --git a/gfxlcd/drawing/area.py b/gfxlcd/drawing/area.py
index 7c0127f..8fc1d19 100644
--- a/gfxlcd/drawing/area.py
+++ b/gfxlcd/drawing/area.py
@@ -7,7 +7,7 @@ class Area(Pixel):
     """Area drawing algorithm"""
     def __init__(self, driver):
         self.driver = driver
-        Pixel.__init__(self)
+        Pixel.__init__(self, driver)
 
     def init(self):
         """additional initialization"""
@@ -18,20 +18,20 @@ class Area(Pixel):
         self._set_area(pos_x, pos_y, pos_x, pos_y)
         self.driver.data(self._converted_color(), None)
 
-    def _set_area(self, x1, y1, x2, y2):
+    def _set_area(self, pos_x1, pos_y1, pos_x2, pos_y2):
         """select area to work with"""
         self.driver.cmd(0x0020, None)
-        self.driver.data(x1, None)
+        self.driver.data(pos_x1, None)
         self.driver.cmd(0x0021, None)
-        self.driver.data(y1, None)
+        self.driver.data(pos_y1, None)
         self.driver.cmd(0x0050, None)
-        self.driver.data(x1, None)
+        self.driver.data(pos_x1, None)
         self.driver.cmd(0x0052, None)
-        self.driver.data(y1, None)
+        self.driver.data(pos_y1, None)
         self.driver.cmd(0x0051, None)
-        self.driver.data(x2, None)
+        self.driver.data(pos_x2, None)
         self.driver.cmd(0x0053, None)
-        self.driver.data(y2, None)
+        self.driver.data(pos_y2, None)
         self.driver.cmd(0x0022, None)
 
     def _draw_vertical_line(self, pos_x, pos_y, length):
@@ -57,35 +57,35 @@ class Area(Pixel):
 
         return steps
 
-    def draw_line(self, x1, y1, x2, y2):
+    def draw_line(self, pos_x1, pos_y1, pos_x2, pos_y2):
         """draw diagonal line"""
-        width = abs(x2 - x1)
-        height = abs(y2 - y1)
-        if x1 == x2:
+        width = abs(pos_x2 - pos_x1)
+        height = abs(pos_y2 - pos_y1)
+        if pos_x1 == pos_x2:
             steps = [height]
             horizontal = False
             offset_x = offset_y = 0
-        elif y1 == y2:
+        elif pos_y1 == pos_y2:
             steps = [width]
             horizontal = True
             offset_x = offset_y = 0
         elif width > height:
-            if x2 < x1:
-                x1, x2 = x2, x1
-                y1, y2 = y2, y1
-            offset_y = 1 if y2 > y1 else -1
-            offset_x = 1 if x2 > x1 else -1
+            if pos_x2 < pos_x1:
+                pos_x1, pos_x2 = pos_x2, pos_x1
+                pos_y1, pos_y2 = pos_y2, pos_y1
+            offset_y = 1 if pos_y2 > pos_y1 else -1
+            offset_x = 1 if pos_x2 > pos_x1 else -1
             horizontal = True
             step = height
             length = width / step
             steps = self._calculate_steps(length, step, width)
 
         else:
-            if y2 < y1:
-                x1, x2 = x2, x1
-                y1, y2 = y2, y1
-            offset_y = 1 if y2 > y1 else -1
-            offset_x = 1 if x2 > x1 else -1
+            if pos_y2 < pos_y1:
+                pos_x1, pos_x2 = pos_x2, pos_x1
+                pos_y1, pos_y2 = pos_y2, pos_y1
+            offset_y = 1 if pos_y2 > pos_y1 else -1
+            offset_x = 1 if pos_x2 > pos_x1 else -1
             horizontal = False
             step = width
             length = height / step
@@ -96,27 +96,27 @@ class Area(Pixel):
         for idx, step in enumerate(steps):
             if horizontal:
                 self._draw_horizontal_line(
-                    int(x1 + delta_x),
-                    int(y1 + (idx * offset_y)),
+                    int(pos_x1 + delta_x),
+                    int(pos_y1 + (idx * offset_y)),
                     int(step)
                 )
                 delta_x += step * offset_x
             else:
                 self._draw_vertical_line(
-                    int(x1 + (idx * offset_x)),
-                    int(y1 + delta_y),
+                    int(pos_x1 + (idx * offset_x)),
+                    int(pos_y1 + delta_y),
                     int(step)
                 )
                 delta_y += step * offset_y
 
-    def fill_rect(self, x1, y1, x2, y2):
+    def fill_rect(self, pos_x1, pos_y1, pos_x2, pos_y2):
         """fill an area"""
-        size = (abs(x2 - x1) + 1) * (abs(y2 - y1) + 1)
+        size = (abs(pos_x2 - pos_x1) + 1) * (abs(pos_y2 - pos_y1) + 1)
         self._set_area(
-            min(x1, x2),
-            min(y1, y2),
-            max(x1, x2),
-            max(y1, y2)
+            min(pos_x1, pos_x2),
+            min(pos_y1, pos_y2),
+            max(pos_x1, pos_x2),
+            max(pos_y1, pos_y2)
         )
         color = self._converted_background_color()
         for _ in range(0, size):
diff --git a/gfxlcd/drawing/page.py b/gfxlcd/drawing/page.py
index 0844018..3ed8c57 100644
--- a/gfxlcd/drawing/page.py
+++ b/gfxlcd/drawing/page.py
@@ -4,17 +4,18 @@ from gfxlcd.drawing.pixel import Pixel
 
 class Page(Pixel, metaclass=abc.ABCMeta):
     """Page drawing algorithm"""
-    def __init__(self):
-        Pixel.__init__(self)
+    def __init__(self, driver):
+        self.driver = driver
+        Pixel.__init__(self, driver)
         self.buffer = []
 
     def init(self):
         """init page"""
         self.buffer = [[0] * (self.height // 8) for x in range(self.width)]
 
-    def draw_pixel(self, x, y):
+    def draw_pixel(self, pos_x, pos_y):
         """draw a pixel at x,y"""
-        self.buffer[x][y//8] |= 1 << (y % 8)
+        self.buffer[pos_x][pos_y//8] |= 1 << (pos_y % 8)
         self.flush()
 
     def _calculate_steps(self, length, step, required_length):
@@ -26,67 +27,67 @@ class Page(Pixel, metaclass=abc.ABCMeta):
 
         return steps
 
-    def draw_line(self, x1, y1, x2, y2):
+    def draw_line(self, pos_x1, pos_y1, pos_x2, pos_y2):
         """draw diagonal line"""
-        width = abs(x2 - x1)
-        height = abs(y2 - y1)
-        if x1 == x2:
+        width = abs(pos_x2 - pos_x1)
+        height = abs(pos_y2 - pos_y1)
+        if pos_x1 == pos_x2:
             steps = [height]
             horizontal = False
             offset_x = offset_y = 0
-        elif y1 == y2:
+        elif pos_y1 == pos_y2:
             steps = [width]
             horizontal = True
             offset_x = offset_y = 0
         elif width > height:
-            if x2 < x1:
-                x1, x2 = x2, x1
-                y1, y2 = y2, y1
-            offset_y = 1 if y2 > y1 else -1
-            offset_x = 1 if x2 > x1 else -1
+            if pos_x2 < pos_x1:
+                pos_x1, pos_x2 = pos_x2, pos_x1
+                pos_y1, pos_y2 = pos_y2, pos_y1
+            offset_y = 1 if pos_y2 > pos_y1 else -1
+            offset_x = 1 if pos_x2 > pos_x1 else -1
             horizontal = True
             step = height
             length = width / step
             steps = self._calculate_steps(length, step, width)
 
         else:
-            if y2 < y1:
-                x1, x2 = x2, x1
-                y1, y2 = y2, y1
-            offset_y = 1 if y2 > y1 else -1
-            offset_x = 1 if x2 > x1 else -1
+            if pos_y2 < pos_y1:
+                pos_x1, pos_x2 = pos_x2, pos_x1
+                pos_y1, pos_y2 = pos_y2, pos_y1
+            offset_y = 1 if pos_y2 > pos_y1 else -1
+            offset_x = 1 if pos_x2 > pos_x1 else -1
             horizontal = False
             step = width
             length = height / step
             steps = self._calculate_steps(length, step, height)
-        dy = 0
-        dx = 0
+        delta_y = 0
+        delta_x = 0
         for idx, step in enumerate(steps):
             if horizontal:
                 for appendix in range(int(step)+1):
                     self.draw_pixel(
-                        int(x1 + dx + appendix),
-                        int(y1 + (idx * offset_y))
+                        int(pos_x1 + delta_x + appendix),
+                        int(pos_y1 + (idx * offset_y))
                     )
-                dx += step * offset_x
+                delta_x += step * offset_x
             else:
                 for appendix in range(int(step)+1):
                     self.draw_pixel(
-                        int(x1 + (idx * offset_x)),
-                        int(y1 + dy + appendix)
+                        int(pos_x1 + (idx * offset_x)),
+                        int(pos_y1 + delta_y + appendix)
                     )
-                dy += step * offset_y
+                delta_y += step * offset_y
 
-    def fill_rect(self, x1, y1, x2, y2):
+    def fill_rect(self, pos_x1, pos_y1, pos_x2, pos_y2):
         """draw a filled rectangle"""
-        if y2 < y1:
-            y1, y2 = y2, y1
-        if x2 < x1:
-            x1, x2 = x2, x1
-        start_page = y1 // 8
-        start_bit = y1 % 8
-        end_page = y2 // 8
-        end_bit = y2 % 8
+        if pos_y2 < pos_y1:
+            pos_y1, pos_y2 = pos_y2, pos_y1
+        if pos_x2 < pos_x1:
+            pos_x1, pos_x2 = pos_x2, pos_x1
+        start_page = pos_y1 // 8
+        start_bit = pos_y1 % 8
+        end_page = pos_y2 // 8
+        end_bit = pos_y2 % 8
         rows = []
         first_page = int(('0' * start_bit).rjust(8, '1'), 2)
         last_page = int('1' * (end_bit+1), 2)
@@ -99,9 +100,9 @@ class Page(Pixel, metaclass=abc.ABCMeta):
             rows.append(first_page & last_page)
 
         page = start_page
-        for v in rows:
-            for x in range(x2-x1+1):
-                self.buffer[x1+x][page] |= v
+        for value in rows:
+            for x in range(pos_x2-pos_x1+1):
+                self.buffer[pos_x1+x][page] |= value
             page += 1
 
     def get_page_value(self, column, page):
diff --git a/gfxlcd/drawing/pixel.py b/gfxlcd/drawing/pixel.py
index 2f6e81f..f07383e 100644
--- a/gfxlcd/drawing/pixel.py
+++ b/gfxlcd/drawing/pixel.py
@@ -1,8 +1,10 @@
+"""Common drawing functions"""
 import math
 
 
 class Pixel(object):
-    def __init__(self):
+    """Pixel class"""
+    def __init__(self, driver):
         self.options['color'] = {
             'R': 255, 'G': 255, 'B': 255
         }
@@ -10,6 +12,14 @@ class Pixel(object):
             'R': 0, 'G': 0, 'B': 0,
         }
 
+    def draw_pixel(self, pos_x, pos_y):
+        """dummy fuction"""
+        pass
+
+    def draw_line(self, pos_x1, pos_y1, pos_x2, pos_y2):
+        """dummy fuction"""
+        pass
+
     def draw_rect(self, x1, y1, x2, y2):
         """draw a rectangle"""
         self.draw_line(x1, y1, x2, y1)
diff --git a/gfxlcd/driver/ili9325/gpio.py b/gfxlcd/driver/ili9325/gpio.py
index fa733d7..4da591b 100644
--- a/gfxlcd/driver/ili9325/gpio.py
+++ b/gfxlcd/driver/ili9325/gpio.py
@@ -1,6 +1,6 @@
 """GPIO communication driver"""
 import time
-import RPi.GPIO # pylint: disable=I0011,F0401
+import RPi.GPIO  # pylint: disable=I0011,F0401
 from gfxlcd.abstract.driver import Driver
 RPi.GPIO.setmode(RPi.GPIO.BCM)
 
diff --git a/gfxlcd/driver/nju6450/gpio.py b/gfxlcd/driver/nju6450/gpio.py
index 56633e2..5605e95 100644
--- a/gfxlcd/driver/nju6450/gpio.py
+++ b/gfxlcd/driver/nju6450/gpio.py
@@ -1,3 +1,4 @@
+"""NJU6450 gpio driver class"""
 import time
 import RPi.GPIO # pylint: disable=I0011,F0401
 from gfxlcd.abstract.driver import Driver
@@ -6,6 +7,7 @@ RPi.GPIO.setmode(RPi.GPIO.BCM)
 
 
 class GPIO(Driver):
+    """GPIO driver"""
     def __init__(self):
         self.pins = {
             'A0': 17,
diff --git a/gfxlcd/driver/nju6450/nju6450.py b/gfxlcd/driver/nju6450/nju6450.py
index 6395d19..200ed15 100644
--- a/gfxlcd/driver/nju6450/nju6450.py
+++ b/gfxlcd/driver/nju6450/nju6450.py
@@ -7,7 +7,7 @@ class NJU6450(Page, Chip):
     """Class for an LCD with NJU6450 chip"""
     def __init__(self, width, height, driver, auto_flush=True):
         Chip.__init__(self, width, height, driver, auto_flush)
-        Page.__init__(self)
+        Page.__init__(self, driver)
 
     def init(self):
         """initialize display"""
@@ -23,7 +23,7 @@ class NJU6450(Page, Chip):
 
     def set_xy(self, pos_x, pos_y):
         """set xy pos"""
-        if x < self.width/2:
+        if pos_x < self.width/2:
             self.driver.cmd(0xB8 | pos_y, 0)
             self.driver.cmd(0x00 | pos_x, 0)
         else:
diff --git a/gfxlcd/driver/ssd1306/spi.py b/gfxlcd/driver/ssd1306/spi.py
index c4d6f6e..94aa946 100644
--- a/gfxlcd/driver/ssd1306/spi.py
+++ b/gfxlcd/driver/ssd1306/spi.py
@@ -1,7 +1,7 @@
 """SPI+GPIO connection driver for SSD1306"""
-import spidev # pylint: disable=I0011,F0401
-import RPi.GPIO as GPIO # pylint: disable=I0011,F0401
 import time
+import spidev  # pylint: disable=I0011,F0401
+import RPi.GPIO as GPIO  # pylint: disable=I0011,F0401
 from gfxlcd.abstract.driver import Driver
 GPIO.setmode(GPIO.BCM)
 
diff --git a/gfxlcd/driver/ssd1306/ssd1306.py b/gfxlcd/driver/ssd1306/ssd1306.py
index 942abae..88aff42 100644
--- a/gfxlcd/driver/ssd1306/ssd1306.py
+++ b/gfxlcd/driver/ssd1306/ssd1306.py
@@ -7,7 +7,7 @@ class SSD1306(Page, Chip):
     """Class for an LCD with SSD306 chip"""
     def __init__(self, width, height, driver, auto_flush=True):
         Chip.__init__(self, width, height, driver, auto_flush)
-        Page.__init__(self)
+        Page.__init__(self, driver)
 
     def init(self):
         """inits a device"""