Nope:
```console
$ find {src,tests}/python/twitter/pants -name "*.py" | xargs grep get_classpath_for_group
src/python/twitter/pants/tasks/checkstyle.py:    cp = egroups.get_classpath_for_group(etag)
src/python/twitter/pants/tasks/check_exclusives.py:  def get_classpath_for_group(self, group_key):
src/python/twitter/pants/tasks/jvm_run.py:      group_classpath = egroups.get_classpath_for_group(group_key)
src/python/twitter/pants/tasks/java_compile.py:          exclusives_classpath = egroups.get_classpath_for_group(group_id)
src/python/twitter/pants/tasks/jvm_task.py:    return egroups.get_classpath_for_group(group_key)
src/python/twitter/pants/tasks/scala_compile.py:    exclusives_classpath = egroups.get_classpath_for_group(exclusives_key)
src/python/twitter/pants/tasks/scala_compile.py:          exclusives_classpath = egroups.get_classpath_for_group(exclusives_key)
tests/python/twitter/pants/tasks/test_check_exclusives.py:    self.assertEquals(egroups.get_classpath_for_group("a=2,b=2"),
tests/python/twitter/pants/tasks/test_check_exclusives.py:    self.assertEquals(egroups.get_classpath_for_group("a=1,b=1"),
tests/python/twitter/pants/tasks/test_check_exclusives.py:    self.assertEquals(egroups.get_classpath_for_group("a=1,b=<none>"),
tests/python/twitter/pants/tasks/test_check_exclusives.py:    self.assertEquals(egroups.get_classpath_for_group("a=<none>,b=<none>"),
tests/python/twitter/pants/tasks/test_check_exclusives.py:    self.assertEquals(egroups.get_classpath_for_group("a=1,b=1"),
```

And those egroups are in fact ExclusivesMapping objects which host the get_classpath_for_group method stored in the depmap.

```python
$ ./pants py src/python/twitter/pants/:pants-lib
Python 2.7.4 (default, Apr 19 2013, 18:28:01) 
[GCC 4.7.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import twitter.pants.tasks.check_exclusives
>>> help(twitter.pants.tasks.check_exclusives)
```
```console
class ExclusivesMapping(__builtin__.object)
     |  Methods defined here:
     |  
     |  __init__(self, context)
     |  
     |  add_conflict(self, key, values)
     |      Register a conflict on an exclusives key.
     |      Parameters:
     |        key the exclusives key with a conflicting_exclusives
     |        value the different values used for the key in different targets.
     |  
     |  get_classpath_for_group(self, group_key)
     |      Get the classpath to use for jvm compilations of a group.
     |      
     |      Each exclusives group requires a distinct classpath. We maintain
     |      them here as a map from the exclusives key to a classpath. The
     |      classpath is updated during compilations to add the results of
     |      compiling a group to the classpaths of other groups that could depend on it.
```