def get_loader(name):
"""
returns a callable associated with the specified animation loader
loaders can be setup by ANIMATION_LOADERS key in the settings file
default loaders are gif_loader and grid_loader
:param str name: name of the loader
"""
try:
return _MATERIALIZED_LOADERS[name]
except KeyError:
_, func = import_string(settings.ANIMATION_LOADERS[name])
_MATERIALIZED_LOADERS[name] = func
return func
def test_import_string():
"""tests if import_string loads the correct module and attribute/class"""
module, func = import_string('yaff.animation.loaders.gif_loader')
assert module == yaff.animation.loaders
assert func == yaff.animation.loaders.gif_loader
