Remove outdated abtest_module

common/lib/xmodule/setup.py

 from setuptools import setup, find_packages
 
 XMODULES = [
-    "abtest = xmodule.abtest_module:ABTestDescriptor",
     "book = xmodule.backcompat_module:TranslateCustomTagDescriptor",
     "chapter = xmodule.seq_module:SequenceDescriptor",
     "combinedopenended = xmodule.combined_open_ended_module:CombinedOpenEndedDescriptor",

common/lib/xmodule/xmodule/abtest_module.py

-import random
-import logging
-from lxml import etree
-
-from xmodule.x_module import XModule
-from xmodule.raw_module import RawDescriptor
-from xmodule.xml_module import XmlDescriptor
-from xmodule.exceptions import InvalidDefinitionError
-from xblock.fields import String, Scope, Dict
-
-DEFAULT = "_DEFAULT_GROUP"
-
-
-log = logging.getLogger(__name__)
-
-
-def group_from_value(groups, v):
-    """
-    Given group: (('a', 0.3), ('b', 0.4), ('c', 0.3)) and random value v
-    in [0,1], return the associated group (in the above case, return
-    'a' if v < 0.3, 'b' if 0.3 <= v < 0.7, and 'c' if v > 0.7
-    """
-    sum = 0
-    for (g, p) in groups:
-        sum = sum + p
-        if sum > v:
-            return g
-
-    # Round off errors might cause us to run to the end of the list.
-    # If the do, return the last element.
-    return g
-
-
-class ABTestFields(object):
-    group_portions = Dict(help="What proportions of students should go in each group", default={DEFAULT: 1}, scope=Scope.content)
-    group_assignments = Dict(help="What group this user belongs to", scope=Scope.preferences, default={})
-    group_content = Dict(help="What content to display to each group", scope=Scope.content, default={DEFAULT: []})
-    experiment = String(help="Experiment that this A/B test belongs to", scope=Scope.content)
-    has_children = True
-
-
-class ABTestModule(ABTestFields, XModule):
-    """
-    Implements an A/B test with an aribtrary number of competing groups
-    """
-
-    def __init__(self, *args, **kwargs):
-        super(ABTestModule, self).__init__(*args, **kwargs)
-
-        if self.group is None:
-            self.group = group_from_value(
-                self.group_portions.items(),
-                random.uniform(0, 1)
-            )
-
-    @property
-    def group(self):
-        return self.group_assignments.get(self.experiment)
-
-    @group.setter
-    def group(self, value):
-        self.group_assignments[self.experiment] = value
-
-    @group.deleter
-    def group(self):
-        del self.group_assignments[self.experiment]
-
-    def get_child_descriptors(self):
-        active_locations = set(self.group_content[self.group])
-        return [desc for desc in self.descriptor.get_children() if desc.location.to_deprecated_string() in active_locations]
-
-    def displayable_items(self):
-        # Most modules return "self" as the displayable_item. We never display ourself
-        # (which is why we don't implement get_html). We only display our children.
-        return self.get_children()
-
-
-# TODO (cpennington): Use Groups should be a first class object, rather than being
-# managed by ABTests
-class ABTestDescriptor(ABTestFields, RawDescriptor, XmlDescriptor):
-    module_class = ABTestModule
-
-    show_in_read_only_mode = True
-
-    @classmethod
-    def definition_from_xml(cls, xml_object, system):
-        """
-        XML Format:
-        <abtest experiment="experiment_name">
-            <group name="a" portion=".1"><contenta/></group>
-            <group name="b" portion=".2"><contentb/></group>
-            <default><contentdefault/></default>
-        </abtest>
-        """
-        experiment = xml_object.get('experiment')
-
-        if experiment is None:
-            raise InvalidDefinitionError(
-                "ABTests must specify an experiment. Not found in:\n{xml}"
-                .format(xml=etree.tostring(xml_object, pretty_print=True)))
-
-        group_portions = {}
-        group_content = {}
-        children = []
-
-        for group in xml_object:
-            if group.tag == 'default':
-                name = DEFAULT
-            else:
-                name = group.get('name')
-                group_portions[name] = float(group.get('portion', 0))
-
-            child_content_urls = []
-            for child in group:
-                try:
-                    child_block = system.process_xml(etree.tostring(child))
-                    child_content_urls.append(child_block.scope_ids.usage_id)
-                except:
-                    log.exception("Unable to load child when parsing ABTest. Continuing...")
-                    continue
-
-            group_content[name] = child_content_urls
-            children.extend(child_content_urls)
-
-        default_portion = 1 - sum(
-            portion for (name, portion) in group_portions.items()
-        )
-
-        if default_portion < 0:
-            raise InvalidDefinitionError("ABTest portions must add up to less than or equal to 1")
-
-        group_portions[DEFAULT] = default_portion
-        children.sort()
-
-        return {
-            'group_portions': group_portions,
-            'group_content': group_content,
-        }, children
-
-    def definition_to_xml(self, resource_fs):
-        xml_object = etree.Element('abtest')
-        xml_object.set('experiment', self.experiment)
-        for name, group in self.group_content.items():
-            if name == DEFAULT:
-                group_elem = etree.SubElement(xml_object, 'default')
-            else:
-                group_elem = etree.SubElement(xml_object, 'group', attrib={
-                    'portion': str(self.group_portions[name]),
-                    'name': name,
-                })
-
-            for child_loc in group:
-                child = self.system.load_item(child_loc)
-                self.runtime.add_block_as_child_node(child, group_elem)
-
-        return xml_object
-
-    def has_dynamic_children(self):
-        return True