Fix python 2 string iterators.

jedi/evaluate/compiled/__init__.py

@@ -33,7 +33,17 @@ class CheckAttribute(object):
 
     def __get__(self, instance, owner):
         # This might raise an AttributeError. That's wanted.
-        getattr(instance.obj, self.check_name)
+        if self.check_name == '__iter__':
+            # Python iterators are a bit strange, because there's no need for
+            # the __iter__ function as long as __getitem__ is defined (it will
+            # just start with __getitem__(0). This is especially true for
+            # Python 2 strings, where `str.__iter__` is not even defined.
+            try:
+                iter(instance.obj)
+            except TypeError:
+                raise AttributeError
+        else:
+            getattr(instance.obj, self.check_name)
         return partial(self.func, instance)
 
 

jedi/evaluate/compiled/fake/builtins.pym

@@ -256,6 +256,11 @@ class str():
     def __init__(self, obj):
         pass
 
+    def strip(self):
+        return str()
+
+    def split(self):
+        return [str()]
 
 class type():
     def mro():

jedi/evaluate/iterable.py

@@ -237,7 +237,8 @@ class Comprehension(AbstractSequence):
 
     @memoize_default()
     def _get_comp_for_context(self, parent_context, comp_for):
-        return parent_context.create_context(comp_for)
+        # TODO shouldn't this be part of create_context?
+        return CompForContext.from_comp_for(parent_context, comp_for)
 
     def _nested(self, comp_fors, parent_context=None):
         evaluator = self.evaluator

test/completion/comprehensions.py

@@ -89,6 +89,9 @@ b = [b for arr in [[[1.0]]] for a in arr for b in a]
 #? float()
 b[0]
 
+#? str()
+[x for x in 'chr'][0]
+
 # jedi issue #26
 #? list()
 a = [[int(v) for v in line.strip().split() if v] for line in ["123", "123", "123"] if line]