PySimpleBarcode 0.1.0

A small Code 39 barcode generator using PIL and the Libre Barcode 39 font family

PySimpleBarcode 0.1.0

A basic Code 39 barcode generator.

---

• About
• Command Line Usage
  • Single Mode
  • File Mode
  • Manifest System
• Module Usage
  • Examples
    • Using the Encoder (the easy way)
    • Using make_barcode directly (the hard way)
  • The Encoder
    • Encoder
  • Functions
    • make_barcode
    • encode_39
    • get_code_39_font_data
    • get_code_39_extended_font_data
    • get_code_39_font_and_extended_font_data
• Single File Usage

---

About^

A basic Code 39 barcode generator using PIL and the Libre Barcode 39 font family

Libre Barcode 39 is subject to the Open Font License and can be found at https://fonts.google.com/specimen/Libre+Barcode+39

Libre Barcode 39 Extended Text is subject to the Open Font License and can be found at https://fonts.google.com/specimen/Libre+Barcode+39+Extended+Text

See OFL.txt for font license details.

Command Line Usage^

Command line usage has two modes of operation: Single mode and File mode. In Single mode, a single barcode is generated using the the prompt passed to the command line. In File mode, a file at a provided path serves as a source of the barcode prompts.

usage: PySimpleBarcode.py [-h] [-e] [-f] [-sc] [-i] [-m] [-o OUTPUT] [-t TYPE] [-s SIZE] [-px PADX] [-py PADY]
                          [-fg FOREGROUND] [-bg BACKGROUND] [-mn MANIFEST_NAME] [-om]
                          value

positional arguments:
  value                 Value or text file with one entry per line to encode. Set -f flag for file mode.

options:
  -h, --help            show this help message and exit
  -e, --extended        Set flag to use extended font. Extended font has a text label below it.
  -f, --file            Set flag to load from text file at path specified by value.
  -sc, --skip_check     Set flag to skip check to see if barcode file already exists
  -i, --ignore_duplicates
                        Set flag to ignore error normally raised on duplicate barcode names being found in the barcode
                        file. File Mode only.
  -m, --manifest        Set flag to generate / update barcode manifest json.
  -o OUTPUT, --output OUTPUT
                        Set to specify output directory name. Defaults to "output"
  -t TYPE, --type TYPE  Set to specify output file type (without filetype) / directory name. Defaults to .png
  -s SIZE, --size SIZE  Set to specify barcode font size. Defaults to 50
  -px PADX, --padx PADX
                        Set to specify barcode x-padding. Defauts to 10
  -py PADY, --pady PADY
                        Set to specify barcode y-padding. Defauts to 10
  -fg FOREGROUND, --foreground FOREGROUND
                        Set to specify barcode foreground in RGBA hexadecimal. Defaults to "#000000FF"
  -bg BACKGROUND, --background BACKGROUND
                        Set to specify barcode background in RGBA hexadecimal. Defaults to "#FFFFFFFF"
  -mn MANIFEST_NAME, --manifest_name MANIFEST_NAME
                        Set to override default manifest name.
  -om, --overwrite_manifest
                        Set to overwrite an existing barcode manifest json (losing current entries), by default an
                        existing json will be updated to include new entries.

Single Mode^

Single mode is useful for one-off production of barcodes. Pass the value to be encoded.

Example usage:

PySimpleBarcode.py 120231

File Mode^

File mode is useful for batch production of barcodes. File mode, as the name suggests, uses a test file with one barcode to generate per line. To enable file mode use the -f flag. A basic commenting system allows comments prefixed by "#" Example barcode file format:

# Comments are supported
900213
900214
900215 # Mid-line comments are supported too.
900216

# Empty lines are ignored.

900217
900218
900219

Example usage:

PySimpleBarcode.py -f barcodes.txt

Manifest System^

Both Single Mode and File Mode have an optional manifest system that allows for easy tracking with an output/manifest.json that maps which barcodes have been generated to their file locations.

Use the -m flag to enable the manifest system.

The -mn argument will override the default manifest name.

The -om argument will cause the script overwrite the previous manifest entirely rather than just adding a new entry, this does not remove the output files from the hard drive.

Module Usage^

Encoder objects simplify handling multiple barcode sub-types.

Examples^

Using the Encoder (the easy way)^

from PySimpleBarcode import Encoder

# Instantiate Encoder with custom background color
encoder = Encoder(background = (200, 200, 255, 255))

# Make standard barcode
barcode = encoder.make_barcode("8675309")

# Show the barcode in a window
barcode.show()

# Save barcode
barcode.save("barcode.png")

# Repeat process for extended barcode
extended_barcode = encoder.make_extended_barcode("8675309")
extended_barcode.show()
extended_barcode.save("extended_barcode.png")

Using make_barcode directly (the hard way)^

from PySimpleBarcode import make_barcode, get_code_39_font_data

# Custom background
background = (200, 200, 255, 255)

# Load normal font from library
font = get_code_39_font_data()

# Make standard barcode
barcode = make_barcode("8675309", font, background=background)

# Show the barcode in a window
barcode.show()

# Save barcode
barcode.save("barcode.png")

# Repeat the process for extended barcode
extended_font = get_code_39_extended_font_data()
extended_barcode = make_barcode("8675309", extended_font, background=background)
extended_barcode.show()
extended_barcode.save("extended_barcode.png")

The Encoder^

Encoder^

Encoder object to set overridable defaults and hold loaded font data. Setting a value in a method will temporarily overide the default.

class Encoder(object):
	def __init__(self, default_size: int = 50, default_padx: int = 10, default_pady: int = 10, default_background: tuple = (255, 255, 255, 255), default_foreground: tuple = (0, 0, 0, 255)):
		...
	def make_barcode(self, val: str, size: int = None, padx: int = None, pady: int = None, background: tuple = None, foreground: tuple = None):
		"""Make normal barcode, returns a PIL Image object."""
	def make_extended_barcode(self, val: str, size: int = None, padx: int = None, pady: int = None, background: tuple = None, foreground: tuple = None):
		"""Make extended barcode, returns a PIL Image object."""

Functions^

make_barcode^

Core barcode generation function, returns a PIL Image object.

def make_barcode(val: str, font: _io.BytesIO, size: int = 50, padx: int = 10, pady: int = 10, background: tuple = (255, 255, 255, 255), foreground: tuple = (0, 0, 0, 255)):
	...

encode_39^

Makes a string ready for the Code 39 font, returns a String.

def encode_39(val: str):
	...

get_code_39_font_data^

Returns a BytesIO file object containing the loaded normal Code 39 font. Takes no arguments.

def get_code_39_font_data():
	...

get_code_39_extended_font_data^

Returns a BytesIO file object containing the loaded extended Code 39 font. Takes no arguments.

def get_code_39_extended_font_data():
	...

get_code_39_font_and_extended_font_data^

Returns a tuple of BytesIO file objects containing the normal and extended fonts. Takes no arguments.

def get_code_39_font_and_extended_font_data():
	...

Single File Usage^

This project was designed with single-file usage in mind.
PySimpleBarcode.py relies on only the standard python library and pillow.
The Libre Barcode 39 TrueType Fonts are packaged within the script file in a compressed format.