Barcode rendering for Python supporting QRcode, Aztec, PDF417, I25, Code128, Code39 and many more types.
A cleverly named, but very simple python barcode renderer wrapping the BWIPP library and ghostscript command line tool.
Install from pip:
python -m pip install treepoem
Python 3.5 to 3.8 supported.
You’ll also need Ghostscript installed. On Ubuntu/Debian this can be installed with:
apt-get install ghostscript
On Mac OS X use:
brew install ghostscript
Otherwise 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:
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generate_barcode(barcode_type, data, options=None)
Generates a barcode and returns it as a PIL image file object (specifically, a PIL.EpsImagePlugin.EpsImageFile).
barcode_type is the name of the barcode type to generate (see below).
data is a str (Python 2 unicode) or bytes (Python 2 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.
For example, this generates a QR code image, and saves it to a file using standard PIL 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 coloring, converting the Image object to monochrome as shown above (image.convert('1')) will likely reduce its file size.
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.
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:
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 parse
Complete usage instructions are shown with treepoem --help.
What’s so clever about the name?
For development of treepoem, when there’s a new BWIPP release:
- Download the latest monolithic zip file from https://github.com/bwipp/postscriptbarcode/releases
- Unzip the files into src/treepoem/postscriptbarcode
- Remove the unneded docs subdirectory.
- Run make_data.py from the root of the repo to update the barcode types that treepoem knows about.
- Add a CHANGELOG note about the upgrade.
- Commit and make a pull request, for examples see https://githugb.com/adamchainz/treepoem/pulls?utf8=%E2%9C%93&q=is%3Apr+is%3Aclosed+upgrade+bwipp
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