AssertionError on render_pdf()

[tsjahangiri]

Hi, I got the assertion error when I called flask_weasyprint render_pdf method

My Code:

html = render_template('report.html', stress_data=#####, steps_data=#####, user_data=#####,
stress_img=#####, steps_img=#####)
pdf = render_pdf(HTML(string=html))

Error:

File "/usr/local/lib/python3.9/dist-packages/weasyprint/layout/block.py", line 299, in _linebox_layout
for i, (line, resume_at) in enumerate(lines_iterator):
File "/usr/local/lib/python3.9/dist-packages/weasyprint/layout/inline.py", line 43, in iter_line_boxes
line, resume_at = get_next_linebox(
File "/usr/local/lib/python3.9/dist-packages/weasyprint/layout/inline.py", line 114, in get_next_linebox
offset_x = text_align(
File "/usr/local/lib/python3.9/dist-packages/weasyprint/layout/inline.py", line 1134, in text_align
assert align == 'end'

Can you please fix that. Thanks

[grewn0uille]

Hello,
It’s a bug in WeasyPrint v54.0, which has been fixed in 54.x branch.

[tsjahangiri]

Thanks for reply. But how then I can use the 54.x branch while using flask_weasyprint library? like flask_weasyprint recent version is 0.6 in which this bug exists.

[grewn0uille]

WeasyPrint is a dependency of Flask-WeasyPrint, which means that when you install Flask-WeasyPrint, the more recent version of WeasyPrint is installed.

If you want to use the 54.x branch, you can use this command: pip install git+https://github.com/Kozea/WeasyPrint.git@54.x.
Else, you can also downgrade your WeasyPrint with pip install WeasyPrint=="53.4".

[tsjahangiri]

Ok thanks for the answer it worked out!