内置测试清单

  • callable(object)
  • Return whether the object is callable (i.e., some kind of function).Note that classes are callable, as are instances with a call() method.
  • defined(value)
  • Return true if the variable is defined:
  1. {% if variable is defined %}
  2.     value of variable: {{ variable }}
  3. {% else %}
  4.     variable is not defined
  5. {% endif %}

See the default() filter for a simple way to set undefinedvariables.

  • divisibleby(value, num)
  • Check if a variable is divisible by a number.
  • escaped(value)
  • Check if the value is escaped.
  • even(value)
  • Return true if the variable is even.
  • iterable(value)
  • Check if it’s possible to iterate over an object.
  • lower(value)
  • Return true if the variable is lowercased.
  • mapping(value)
  • Return true if the object is a mapping (dict etc.).

New in version 2.6.

  • none(value)
  • Return true if the variable is none.
  • number(value)
  • Return true if the variable is a number.
  • odd(value)
  • Return true if the variable is odd.
  • sameas(value, other)
  • Check if an object points to the same memory address than anotherobject:
  1. {% if foo.attribute is sameas false %}
  2.     the foo attribute really is the `False` singleton
  3. {% endif %}
  • sequence(value)
  • Return true if the variable is a sequence. Sequences are variablesthat are iterable.
  • string(value)
  • Return true if the object is a string.
  • undefined(value)
  • Like defined() but the other way round.
  • upper(value)
  • Return true if the variable is uppercased.