diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 015a450f8b7affd3c9630df0af54e466e310fa49..a458e52d99a099f588afec1fe160231b1eb79f4d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -28,29 +28,14 @@ Python 2.7:
     reports:
       junit: test/pytest.xml
 
-Python 3.6:
+Python 3:
   script:
-  - py_version=3.6
+  - py_version=3
   - EXTRA_INSTALL=numpy
   - curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/build-and-test-py-project.sh
   - ". ./build-and-test-py-project.sh"
   tags:
-  - python3.6
-  - gfortran
-  except:
-  - tags
-  artifacts:
-    reports:
-      junit: test/pytest.xml
-
-Python 3.7:
-  script:
-  - py_version=3.7
-  - EXTRA_INSTALL=numpy
-  - curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/build-and-test-py-project.sh
-  - ". ./build-and-test-py-project.sh"
-  tags:
-  - python3.7
+  - python3
   - gfortran
   except:
   - tags
@@ -64,7 +49,7 @@ Documentation:
   - curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/build-docs.sh
   - ". ./build-docs.sh"
   tags:
-  - python3.5
+  - python3
   only:
   - master
 
@@ -73,6 +58,6 @@ Flake8:
   - curl -L -O -k https://gitlab.tiker.net/inducer/ci-support/raw/master/prepare-and-run-flake8.sh
   - ". ./prepare-and-run-flake8.sh dagrt test"
   tags:
-  - python3.5
+  - python3
   except:
   - tags
diff --git a/dagrt/language.py b/dagrt/language.py
index a5d3ca88f6d01033e1f09285a62d3bf34b578a73..71769ead1450b5a64802a1dfddc46911c68caa18 100644
--- a/dagrt/language.py
+++ b/dagrt/language.py
@@ -154,26 +154,26 @@ Code Creation
 # {{{ utilities
 
 def _stringify_statements(roots, id_to_stmt, prefix=""):
-        lines = []
+    lines = []
 
-        printed_stmt_ids = set()
+    printed_stmt_ids = set()
 
-        def print_stmt(stmt):
-            if stmt.id in printed_stmt_ids:
-                return
-            printed_stmt_ids.add(stmt.id)
+    def print_stmt(stmt):
+        if stmt.id in printed_stmt_ids:
+            return
+        printed_stmt_ids.add(stmt.id)
 
-            for dep_id in stmt.depends_on:
-                print_stmt(id_to_stmt[dep_id])
+        for dep_id in stmt.depends_on:
+            print_stmt(id_to_stmt[dep_id])
 
-            lines.append(
-                    "%s{%s} %s" % (
-                        prefix, stmt.id, str(stmt).replace("\n", "\n        ")))
+        lines.append(
+                "%s{%s} %s" % (
+                    prefix, stmt.id, str(stmt).replace("\n", "\n        ")))
 
-        for root_stmt in roots:
-            print_stmt(root_stmt)
+    for root_stmt in roots:
+        print_stmt(root_stmt)
 
-        return lines
+    return lines
 
 # }}}