TemplateSyntaxError: expected token 'end of print statement'

TemplateSyntaxError: expected token

$ flask run
Traceback (most recent call last):
  ...
jinja2.exceptions.TemplateSyntaxError: expected token 'end of print statement', got ':'

Why this happens

This indicates malformed Jinja syntax—unclosed braces, using {% %} instead of {{ }} for expressions, or stray punctuation causing the parser to expect the end of a print statement. Another source is mixing Python syntax with Jinja in templates (e.g., for x in y: when missing {% and %}), or adding filters/conditions incorrectly.

Fix

• Distinguish {{ ... }} (print expression) from {% ... %} (statements like for/if/block).
• Close all blocks ({% endfor %}, {% endif %}).
• Validate filters and expressions; keep complex logic in views and pass simple data to templates.

Wrong code

<p>{{ user.name: }}</p>
<!-- stray colon -->
{% if user %}
<p>{{ user.name }}</p>
<!-- missing endif -->

Fixed code

{% if user %}
<p>{{ user.name }}</p>
{% endif %}