environment.tests

Built-in tests for Kida templates.

Tests are boolean predicates used withisin conditionals: {% if value is test %}or{% if value is test(arg) %}

Categories:

Type Tests:

• defined: Value is not None
• undefined: Value is None
• none: Value is None (alias)
• string: Value is a string
• number: Value is int or float (not bool)
• sequence: Value is list, tuple, or string
• mapping: Value is a dict
• iterable: Value supports iteration
• callable: Value is callable

Boolean Tests:

• true: Value is exactly True
• false: Value is exactly False

Number Tests:

• odd: Integer is odd
• even: Integer is even
• divisibleby(n): Integer is divisible by n

Comparison Tests:

• eq(other)/equalto(other): Equal to other
• ne(other): Not equal to other
• lt(other)/lessthan(other): Less than other
• le(other): Less than or equal
• gt(other)/greaterthan(other): Greater than other
• ge(other): Greater than or equal
• sameas(other): Identity comparison (is)
• in(seq): Value is in sequence

String Tests:

• lower: String is all lowercase
• upper: String is all uppercase

Negation:

Useis notfor negated tests: {% if user is not defined %}or{% if count is not even %}

Example:

```jinja
{% if posts is defined and posts is iterable %}
    {% for post in posts %}
        {% if loop.index is odd %}
            <div class="odd">{{ post.title }}</div>
        {% endif %}
    {% endfor %}
{% endif %}
```

Custom Tests:

>>> env.add_test('prime', lambda n: n > 1 and all(n % i for i in range(2, n)))
>>> # {% if 17 is prime %}Yes{% endif %}