refactor PEP8 and code style

escpos/cli.py

@@ -18,6 +18,7 @@ import sys
 import six
 from . import config
 
+
 # Must be defined before it's used in DEMO_FUNCTIONS
 def str_to_bool(string):
     """ Used as a type in argparse so that we get back a proper
@@ -34,7 +35,7 @@ REQUIRES_NEWLINE = ('qr', 'barcode', 'text', 'block_text')
 # Value: A list of dictionaries to pass to the escpos function as arguments.
 DEMO_FUNCTIONS = {
     'text': [
-        {'txt': 'Hello, World!\n',}
+        {'txt': 'Hello, World!\n', }
     ],
     'qr': [
         {'content': 'This tests a QR code'},
@@ -427,6 +428,7 @@ ESCPOS_COMMANDS = [
     },
 ]
 
+
 def main():
     """
 
@@ -504,7 +506,6 @@ def main():
     saved_config.load(config_path)
     printer = saved_config.printer()
 
-
     if not printer:
         raise Exception('No printers loaded from config')
 
@@ -519,6 +520,7 @@ def main():
         command_arguments['printer'] = printer
         globals()[target_command](**command_arguments)
 
+
 def demo(printer, **kwargs):
     """
     Prints specificed demos. Called when CLI is passed `demo`. This function

escpos/config.py

@@ -16,6 +16,7 @@ import yaml
 from . import printer
 from . import exceptions
 
+
 class Config(object):
     """  Configuration handler class.
 
@@ -115,4 +116,3 @@ class Config(object):
             self._printer = getattr(printer, self._printer_name)(**self._printer_config)
 
         return self._printer
-

escpos/constants.py

@@ -31,21 +31,21 @@ FS  = b'\x1c'
 GS  = b'\x1d'
 
 # Feed control sequences
-CTL_LF = b'\n'             # Print and line feed
+CTL_LF = b'\n'              # Print and line feed
-CTL_FF = b'\f'             # Form feed
+CTL_FF = b'\f'              # Form feed
-CTL_CR = b'\r'             # Carriage return
+CTL_CR = b'\r'              # Carriage return
-CTL_HT = b'\t'             # Horizontal tab
+CTL_HT = b'\t'              # Horizontal tab
-CTL_SET_HT = ESC + b'\x44' # Set horizontal tab positions
+CTL_SET_HT = ESC + b'\x44'  # Set horizontal tab positions
-CTL_VT = b'\v'             # Vertical tab
+CTL_VT = b'\v'              # Vertical tab
 
 # Printer hardware
 HW_INIT   = ESC + b'@'             # Clear data in buffer and reset modes
 HW_SELECT = ESC + b'=\x01'         # Printer select
 
-HW_RESET  = ESC + b'\x3f\x0a\x00'  # Reset printer hardware
+HW_RESET  = ESC + b'\x3f\x0a\x00'   # Reset printer hardware
-                                  # (TODO: Where is this specified?)
+                                    # (TODO: Where is this specified?)
 
-#{ Cash Drawer (ESC p <pin> <on time: 2*ms> <off time: 2*ms>)
+# Cash Drawer (ESC p <pin> <on time: 2*ms> <off time: 2*ms>)
 _CASH_DRAWER = lambda m, t1='', t2='': ESC + b'p' + m + six.int2byte(t1) + six.int2byte(t2)
 CD_KICK_2 = _CASH_DRAWER(b'\x00', 50, 50)  # Sends a pulse to pin 2 []
 CD_KICK_5 = _CASH_DRAWER(b'\x01', 50, 50)  # Sends a pulse to pin 5 []
@@ -137,7 +137,7 @@ BARCODE_FONT_B = _SET_HRI_FONT(b'\x01')  # Font type B for HRI barcode chars
 BARCODE_HEIGHT = GS + b'h'  # Barcode Height [1-255]
 BARCODE_WIDTH  = GS + b'w'  # Barcode Width  [2-6]
 
-#NOTE: This isn't actually an ESC/POS command. It's the common prefix to the
+# NOTE: This isn't actually an ESC/POS command. It's the common prefix to the
 #      two "print bar code" commands:
 #      -  Type A: "GS k <type as integer> <data> NUL"
 #      -  TYPE B: "GS k <type as letter> <data length> <data>"
@@ -184,13 +184,13 @@ BARCODE_TYPES = {
     'B': BARCODE_TYPE_B,
 }
 
-## QRCode error correction levels
+# QRCode error correction levels
 QR_ECLEVEL_L = 0
 QR_ECLEVEL_M = 1
 QR_ECLEVEL_Q = 2
 QR_ECLEVEL_H = 3
     
-## QRcode models
+# QRcode models
 QR_MODEL_1 = 1
 QR_MODEL_2 = 2
 QR_MICRO = 3
@@ -205,12 +205,12 @@ S_RASTER_2H = _PRINT_RASTER_IMG(b'\x02')  # Set raster image double height
 S_RASTER_Q  = _PRINT_RASTER_IMG(b'\x03')  # Set raster image quadruple
 
 # Printing Density
-PD_N50          = GS + b'\x7c\x00'  # Printing Density -50%
+PD_N50 = GS + b'\x7c\x00'  # Printing Density -50%
-PD_N37          = GS + b'\x7c\x01'  # Printing Density -37.5%
+PD_N37 = GS + b'\x7c\x01'  # Printing Density -37.5%
-PD_N25          = GS + b'\x7c\x02'  # Printing Density -25%
+PD_N25 = GS + b'\x7c\x02'  # Printing Density -25%
-PD_N12          = GS + b'\x7c\x03'  # Printing Density -12.5%
+PD_N12 = GS + b'\x7c\x03'  # Printing Density -12.5%
-PD_0            = GS + b'\x7c\x04'  # Printing Density  0%
+PD_0   = GS + b'\x7c\x04'  # Printing Density  0%
-PD_P50          = GS + b'\x7c\x08'  # Printing Density +50%
+PD_P50 = GS + b'\x7c\x08'  # Printing Density +50%
-PD_P37          = GS + b'\x7c\x07'  # Printing Density +37.5%
+PD_P37 = GS + b'\x7c\x07'  # Printing Density +37.5%
-PD_P25          = GS + b'\x7c\x06'  # Printing Density +25%
+PD_P25 = GS + b'\x7c\x06'  # Printing Density +25%
-PD_P12          = GS + b'\x7c\x05'  # Printing Density +12.5%
+PD_P12 = GS + b'\x7c\x05'  # Printing Density +12.5%

escpos/escpos.py

@@ -24,6 +24,7 @@ from .exceptions import *
 from abc import ABCMeta, abstractmethod  # abstract base class support
 from escpos.image import EscposImage
 
+
 @six.add_metaclass(ABCMeta)
 class Escpos(object):
     """ ESC/POS Printer object
@@ -122,11 +123,14 @@ class Escpos(object):
         """ Print QR Code for the provided string
 
         :param content: The content of the code. Numeric data will be more efficiently compacted.
-        :param ec: Error-correction level to use. One of QR_ECLEVEL_L (default), QR_ECLEVEL_M, QR_ECLEVEL_Q or QR_ECLEVEL_H.
+        :param ec: Error-correction level to use. One of QR_ECLEVEL_L (default), QR_ECLEVEL_M, QR_ECLEVEL_Q or
+            QR_ECLEVEL_H.
             Higher error correction results in a less compact code.
         :param size: Pixel size to use. Must be 1-16 (default 3)
-        :param model: QR code model to use. Must be one of QR_MODEL_1, QR_MODEL_2 (default) or QR_MICRO (not supported by all printers).
+        :param model: QR code model to use. Must be one of QR_MODEL_1, QR_MODEL_2 (default) or QR_MICRO (not supported
-        :param native: True to render the code on the printer, False to render the code as an image and send it to the printer (Default)
+            by all printers).
+        :param native: True to render the code on the printer, False to render the code as an image and send it to the
+            printer (Default)
         """
         # Basic validation
         if ec not in [QR_ECLEVEL_L, QR_ECLEVEL_M, QR_ECLEVEL_H, QR_ECLEVEL_Q]:
@@ -143,11 +147,11 @@ class Escpos(object):
             if model != QR_MODEL_2:
                 raise ValueError("Invalid QR model for qrlib rendering (must be QR_MODEL_2)")
             python_qr_ec = {
-                     QR_ECLEVEL_H: qrcode.constants.ERROR_CORRECT_H,
+                QR_ECLEVEL_H: qrcode.constants.ERROR_CORRECT_H,
-                     QR_ECLEVEL_L: qrcode.constants.ERROR_CORRECT_L,
+                QR_ECLEVEL_L: qrcode.constants.ERROR_CORRECT_L,
-                     QR_ECLEVEL_M: qrcode.constants.ERROR_CORRECT_M,
+                QR_ECLEVEL_M: qrcode.constants.ERROR_CORRECT_M,
-                     QR_ECLEVEL_Q: qrcode.constants.ERROR_CORRECT_Q
+                QR_ECLEVEL_Q: qrcode.constants.ERROR_CORRECT_Q
-                     }
+            }
             qr_code = qrcode.QRCode(version=None, box_size=size, border=1, error_correction=python_qr_ec[ec])
             qr_code.add_data(content)
             qr_code.make(fit=True)
@@ -435,7 +439,8 @@ class Escpos(object):
         col_count = self.columns if columns is None else columns
         self.text(textwrap.fill(txt, col_count))
 
-    def set(self, align='left', font='a', text_type='normal', width=1, height=1, density=9, invert=False, smooth=False, flip=False):
+    def set(self, align='left', font='a', text_type='normal', width=1, height=1, density=9, invert=False, smooth=False,
+            flip=False):
         """ Set text properties by sending them to the printer
 
         :param align: horizontal position for text, possible values are:

escpos/exceptions.py

@@ -210,6 +210,7 @@ class ConfigNotFoundError(Error):
     def __str__(self):
         return "Configuration not found ({msg})".format(msg=self.msg)
 
+
 class ConfigSyntaxError(Error):
     """ The configuration file is invalid
 
@@ -224,6 +225,7 @@ class ConfigSyntaxError(Error):
     def __str__(self):
         return "Configuration syntax is invalid ({msg})".format(msg=self.msg)
 
+
 class ConfigSectionMissingError(Error):
     """ The configuration file is missing a section
 

escpos/printer.py

@@ -21,6 +21,7 @@ import socket
 from .escpos import Escpos
 from .exceptions import *
 
+
 class Usb(Escpos):
     """ USB printer
 
@@ -261,6 +262,7 @@ class File(Escpos):
         self.device.flush()
         self.device.close()
 
+
 class Dummy(Escpos):
     """ Dummy printer
 

setup.py

@@ -3,7 +3,7 @@
 import os
 import sys
 from setuptools import setup
-from setuptools.command.test import test as TestCommand
+from setuptools.command.test import test as test_command
 
 
 def read(fname):
@@ -11,18 +11,18 @@ def read(fname):
     return open(os.path.join(os.path.dirname(__file__), fname)).read()
 
 
-class Tox(TestCommand):
+class Tox(test_command):
     """proxy class that enables tox to be run with setup.py test"""
     user_options = [('tox-args=', 'a', "Arguments to pass to tox")]
 
     def initialize_options(self):
         """initialize the user-options"""
-        TestCommand.initialize_options(self)
+        test_command.initialize_options(self)
         self.tox_args = None
 
     def finalize_options(self):
         """finalize user-options"""
-        TestCommand.finalize_options(self)
+        test_command.finalize_options(self)
         self.test_args = []
         self.test_suite = True