Assertion Error in 54.0

[janpeterka]

I started getting AssertionError:

  File "/home/jan/.local/share/virtualenvs/kucharka-vjOexrDR/lib/python3.9/site-packages/weasyprint/layout/inline.py", line 1134, in text_align
    assert align == 'end'

Code was working in 53.4, not working now in 54.0

Downgrading to 53.4 solves the problem.

[grewn0uille]

Hello!
Can you please share the related HTML/CSS?

[janpeterka]

Sure, but it happens on all render_pfd pages (using Flask-Weasyprint).

Controller:

    def pdf(self, id):
        from flask_weasyprint import render_pdf, HTML

        return render_pdf(HTML(string=self.template(template_name="show", print=True)))

Template:

{% extends "base/base.html.j2" %}
{% block title %} {{ recipe.name }} {% endblock %}

{% block content %}

<div id="recipe-info">
    <h2> {{ recipe.name }} </h2> 
</div>

<div class="row">
    <div class="col-md-10 col-sm-12">
        <table id="ingredients" class="table">
    <thead>
        <tr>
            <th>{{ texts.title }}</th>
            <th>Množství (na {{recipe.portion_count}} porcí)</th>
            <th></th>
        </tr>
    </thead>

    {% for ingredient in recipe.ingredients: %}
        {% set ingredient_amount = ingredient.amount * recipe.portion_count %}

        <tr>
            {% if not print and current_user.is_authenticated %}
                <td> {{ link_to(ingredient) }}
                    {% if ingredient.is_public %} {{ icon("public", class="text-secondary") }} {% endif %}
                </td>
            {% else %}
                <td> {{ ingredient.name }} </td>
            {% endif %}

            <td>
            {% if ingredient.is_measured %}
                {% if ingredient.measurement.thousand_fold and ingredient_amount % 1000 != ingredient_amount %}
                    {{ formatted_amount(ingredient_amount/1000) }} {{ ingredient.measurement.thousand_fold }}
                {% else %}
                    {{ formatted_amount(ingredient_amount) }} {{ ingredient.measurement.name }}
                {% endif %}

                {% if ingredient.alternative_measurement %}
                    {% set ns = namespace(title="přibližně\n") %}      
                    {% for conversion in ingredient.alternative_measurements %}
                        {% set ns.title = ns.title + formatted_amount(ingredient_amount/conversion.amount_from * conversion.amount_to) | string + " " + conversion.to_measurement.name %}

                        {% set ns.title = ns.title + "\n" %}
                    {% endfor %}
                    <abbr title="{{ ns.title }}">
                         {{ icon("info-circle", class="ms-1") }}
                    </abbr>   
                {% endif %}

            {% endif %}
            </td>

            <td><em>{{ ingredient.comment|default("", True) }}</em></td>
        </tr>
    {% endfor %}
</table>
    </div>
</div>


{% endblock %}

using Bootstrap for design

[grewn0uille]

Thanks for this bug report! It’s now fix in the 54.x branch.

This crash was caused by a variable that isn’t set in Bootstrap for text-align, which lead to a None value.