To show form with error message if not valid with Python Django Forms, we can use form.errors to check for errors.
For instance, we write
{% if form.errors %}
{% for field in form %}
{% for error in field.errors %}
<div class="alert alert-danger">
<strong>{{ error|escape }}</strong>
</div>
{% endfor %}
{% endfor %}
{% for error in form.non_field_errors %}
<div class="alert alert-danger">
<strong>{{ error|escape }}</strong>
</div>
{% endfor %}
{% endif %}
to use form.errors in the if block to check for errors.
If there’re any errors, then we loop through the form errors and render the field.errors with a for loop.
And we render non-field errors by looping through form.non_field_errors with another for loop.
