Barcode rendering for Python supporting QRcode, Aztec, PDF417, I25, Code128, Code39 and many more types.
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Project description
A cleverly named, but very simple python barcode renderer wrapping the BWIPP library and ghostscript command line tool.
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Installation
Install from pip:
python -m pip install treepoemPython 3.9 to 3.13 supported.
You’ll also need Ghostscript installed. On Ubuntu/Debian this can be installed with:
apt-get install ghostscriptOn Mac OS X use:
brew install ghostscriptOtherwise refer to your distribution’s package manager, though it’s likely to be called ghostscript too.
There’s a known issue with rendering on Ghostscript 9.22+ where images are smeared. See GitHub Issue #124 and its associated links for more details. Ghostscript merged a fix in version 9.26 and common barcodes seem to work from then on, though still with some smearing.
You can check your Ghostscript version with:
gs --versionAPI
generate_barcode(barcode_type: str, data: str | bytes, options: dict[str, str | bool] | None=None, *, scale: int = 2) -> Image
Generates a barcode and returns it as a PIL Image object
barcode_type is the name of the barcode type to generate (see below).
data is a str or bytes of data to embed in the barcode - the amount that can be embedded varies by type.
options is a dictionary of strings-to-strings of extra options to be passed to BWIPP, as per its docs.
scale controls the output image size. Use 1 for the smallest image and larger values for larger images.
For example, this generates a QR code image, and saves it to a file using Image.save():
import treepoem
image = treepoem.generate_barcode(
barcode_type="qrcode", # One of the BWIPP supported codes.
data="barcode payload",
)
image.convert("1").save("barcode.png")If your barcode image is monochrome, with no additional text or colouring, converting the Image object to monochrome (image.convert("1")) will likely reduce its file size.
barcode_types: dict[str, BarcodeType]
This is a dict of the ~100 names of the barcode types that the vendored version of BWIPP supports: its keys are strs of the barcode type encoder names, and the values are instances of BarcodeType.
BarcodeType
A class representing meta information on the types. It has two attributes:
type_code - the value needed for the barcode_type argument of generate_barcode() to use this type.
description - the human level description of the type which has two str.
Only these common types are used in the test suite:
qrcode - QR Code
azteccode - Aztec Code
pdf417 - PDF417
interleaved2of5 - Interleaved 2 of 5
code128 - Code 128
code39 - Code 39
Command-line interface
Treepoem also includes a simple command-line interface to the functionality of generate_barcode. For example, these commands will generate two QR codes with identical contents, but different levels of error correction (see QR Code Options):
$ treepoem -o barcode1.png -t qrcode "This is a test" eclevel=H
$ treepoem -o barcode2.png -t qrcode "^084his is a test" eclevel=L parseComplete usage instructions are shown with treepoem --help.
What’s so clever about the name?
Barcode.
Bark ode.
Tree poem.
Updating BWIPP
For development of treepoem, when there’s a new BWIPP release:
Run ./download_bwipp.py with the version of BWIPP to download.
Run ./make_data.py to update the barcode types that treepoem knows about.
Add a note in CHANGELOG.rst about the upgrade, adapting from the previous one.
Commit and make a pull request, adapting from previous examples.
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