i already install barcode module from official python site like "pip install python-barcode". but whenever i write a code on text editor like 1-Visual Studio 2-SubLime 3-Pycharm theirs an error pop up and it's says "Unable to import 'barcode' pylint(input-error)[1,1]"

Traceback (most recent call last):
  File "site-packages\PIL\ImageFont.py", line 186, in __init__
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe5 in position 9: ordinal not in range(128)

This error occurs under python3.6, how to solve it

I'm running Python 3.5.5. A subsection of the usage guide:

import barcode
from barcode.writer import ImageWriter
EAN = barcode.get_barcode_class('code128')
ean = EAN(u'5901234123457', writer=ImageWriter())

...gives me the following error:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-67-21778fac1b87> in <module>()
----> 1 ean = EAN(u'5901234123457', writer=ImageWriter())

TypeError: 'NoneType' object is not callable

Am I doing something wrong?

Hello!

Pillow 9.2.0 is installed in my virtualenv and when I use python-barcode there is a deprecation warning about the method ImageFont.getsize.

virtualenv/lib/python3.9/site-packages/barcode/writer.py:441: DeprecationWarning: getsize is deprecated and will be removed in Pillow 10 (2023-07-01). Use getbbox or getlength instead.
    width, height = font.getsize(subtext)

Since the version 9.2, getsize is deprecated and replaced by getlength. See the PR https://github.com/python-pillow/Pillow/pull/6381.

I think the title explains it all.

If I try to use .raw to server an SVG barcode without using .save first, I get an empty output...

Example: Trying to serve this in my django project:

class APIBarcode(View):

    def get(self, request, *args, **kwargs):
        uuid = request.GET.get('uuid')
        C39 = barcode.get_barcode_class('code39')
        toserve = C39(uuid)
        toserve.save('c39code')
        return HttpResponse(toserve.raw, content_type="image/svg+xml")

Gives the following output:

But serving this:

class APIBarcode(View):

    def get(self, request, *args, **kwargs):
        uuid = request.GET.get('uuid')
        C39 = barcode.get_barcode_class('code39')
        toserve = C39(uuid)
        # toserve.save('c39code')
        return HttpResponse(toserve.raw, content_type="image/svg+xml")

Gives the following output:

If someone can point me to where I should be looking I would gladly attempt to fix it!

fixes #79 and maybe others?

This might seem trivial, but took me a couple of minutes to track it down. I'm attaching false-colored images for reference. Please pay attention to the final white bar in particular. SvgWriter is not affected as the rectangle implementation is different.

DPI 300

before

after

DPI 100

before

after

Moved super().__init__ before calling _calculate_checksum() to check if the string contains any letters to prevent value errors that can happen when calculating checksum. I tested the new version with the input 0132354187 and the produced barcode before and after the commit is the same as 9780132352.

This PR tries to partially solve Issue #11

Adds a parameter to both classes that controls if we want longer guard bars and then while building the code to be generated, use "G" instead of "1" in those places we will need to have a longer bar.

During the write, interpret every "G" the same as "1" but add an height factor to the mod list. To avoid changing the entire code base to add a height parameter, set the self.module_height for every bar generated.

In the new version if I try to use:

import barcode
barcode.generate('ean13', '123455559121112')

I get an error TypeError: get() got an unexpected keyword argument 'writer_options' I get this both in version 0.12 and 0.13. Is there something I can do about this, or is this a bug?

According to the specs I've found, GTIN-13/EAN-13 barcodes must contain the grouping most commonly found on printed barcodes, i.e. the first character is outside of the code area, and the remainder is in two groups with elongated bars separating the groups.

Is there any support for this planned? How about the '>' mark for silent areas?

python-barcode/barcode/writer.py:441: DeprecationWarning: getsize is deprecated and will be removed in Pillow 10 (2023-07-01). Use getbbox or getlength instead. width, height = font.getsize(subtext)

ImageFont.getsize is deprecated since the version 9.2 of Pillow. We use anchor instead of computing the right position to have an aligned text.

It is related to the issue #163. The solution was suggested by @nulano (contributor of Pillow).

also allows encoding of strings and bytestrings (allows encoding any symbol) by converting them to int ; in this case, string representation is shown in human-readable string

Implement PZN8 code generation. Fixes #167.

• keeping PZN for PZN7, implementing PZN8 for PZN8
• checksum is commonly part of the PZN* code. Hence, we verify or append the checksum based on the length of the supplied PZN7 or PZN8 code.
• explicit error messages concerning code length for both classes respectively
• different checksum calculation for PZN8. see http://www.pruefziffernberechnung.de/P/PZN.shtml

usage

check code length

>>> PZN('12345678')
barcode.errors.NumberOfDigitsError: PZN7 must have 6 digits (excluding checksum) or 7 digits (including checksum), not 8.
>>> PZN8('123456789')
barcode.errors.NumberOfDigitsError: PZN8 must have 7 digits (excluding checksum) or 8 digits (including checksum), not 9.

auto-append checksum

>>> PZN('123456')
<PZN7('PZN-1234562')>
>>> PZN8('1234567')
<PZN8('PZN-12345678')>

verify checksum if supplied

>>> PZN('1234568')
barcode.errors.BarcodeError: Checksum (last digit) is not valid for the supplied PZN7 code.
>>> PZN('1234562')
<PZN7('PZN-1234562')>

resources (mostly german)

• checksum details http://www.pruefziffernberechnung.de/P/PZN.shtml
• official specification https://www.ifaffm.de/de/ifa-codingsystem/codierung-pzn-code_39.html

samples

PZN7: https://barcode.tec-it.com/de/Health_PZN7

PZN8: https://www.softmatic.com/de/barcode-code-pzn.html

I'm being told (not a barcode format specialist) that the standard presentation for a UPC/UPCA code should look like this:

If I generate this barcode using the following code however, I get this:

Issues:

Added "F" at the end?

Any way to turn this off?

Guardbars not displayed

As I seem to understand, the standard/typical presentation for those code should include guardbars. I tried adding the "guardbars" keywords but it seems the UPC class doesn't accept that argument.

Code:

python-barcode create 686254053919 upc

Also generated as part of a server-side rendering, with same result:

UPCA(str(value["code"]), writer=SVGWriter(), guardbars=True).write(file)

I believe text is incorrectly located in barcode when using ImageWriter as of 0.14.0. This is mainly due to a wrong computation of text height which is a very common problem due to the fact that total height for a font is different from the height of rendered glyphs for most of the ascii characters.

Attached is a proposed patch to place text correctly. Note that because most of the time a barcode is followed by a text with capital letters, the blank space at the bottom is more that 1mm (which would be nice to set as an option). It should be closer to 1mm when using letters that goes below the font baseline ('p', 'q', etc).

text_placement.patch.txt