wtf form stringfield optional code example

Example 1: selectfield flask wtf

HOUR_CHOICES = [('1', '8am'), ('2', '10am')]

class TestForm(Form):
     hour = SelectField(u'Hour', choices=HOUR_CHOICES)

Example 2: flask form options

{% macro render_field(field) %}
  <dt>{{ field.label }}
  <dd>{{ field(**kwargs)|safe }}
  {% if field.errors %}
    <ul class=errors>
    {% for error in field.errors %}
      <li>{{ error }}</li>
    {% endfor %}
    </ul>
  {% endif %}
  </dd>
{% endmacro %}