Make RestrictedPython compatible to Python3.7. (#138)

* Make RestrictedPython compatible to Python3.7.
* with Python3.7 compatibility, we must check it and do not allow failure builds
* add workaround to test Python3.7

.travis.yml

@@ -15,15 +15,17 @@ matrix:
           env: TOXENV=py36,py36-datetime
         - python: "3.7"
           env: TOXENV=py37,py37-datetime
+          dist: xenial
+          sudo: true
         - python: "3.7-dev"
           env: TOXENV=py37,py37-datetime
+          dist: xenial
+          sudo: true
         - python: "3.8-dev"
           env: TOXENV=py38,py38-datetime
+          dist: xenial
+          sudo: true
     allow_failures:
-        - python: "3.7"
-          env: TOXENV=py37,py37-datetime
-        - python: "3.7-dev"
-          env: TOXENV=py37,py37-datetime
         - python: "3.8-dev"
           env: TOXENV=py38,py38-datetime
 

appveyor.yml

@@ -2,7 +2,6 @@
 
 matrix:
   allow_failures:
-  - PROFILE: py37
   - PROFILE: py38
 
 environment:

setup.py

@@ -52,7 +52,7 @@ def read(*rnames):
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
-        # 'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: CPython',
         'Topic :: Security',
     ],

src/RestrictedPython/_compat.py

@@ -7,6 +7,8 @@
 IS_PY3 = _version.major == 3
 IS_PY34_OR_GREATER = _version.major == 3 and _version.minor >= 4
 IS_PY35_OR_GREATER = _version.major == 3 and _version.minor >= 5
+IS_PY36_OR_GREATER = _version.major == 3 and _version.minor >= 6
+IS_PY37_OR_GREATER = _version.major == 3 and _version.minor >= 7
 
 if IS_PY2:
     basestring = basestring  # NOQA: F821  # Python 2 only built-in function

src/RestrictedPython/transformer.py

@@ -71,6 +71,7 @@
     'print',
     'printed',
     'builtins',
+    'breakpoint',
 ])
 
 

tests/transformer/test_breakpoint.py

@@ -0,0 +1,13 @@
+from tests import c_exec
+
+import pytest
+
+
+@pytest.mark.parametrize(*c_exec)
+def test_call_breakpoint(c_exec):
+    """The Python3.7+ builtin function breakpoint should not
+    be used and is forbidden in RestrictedPython.
+    """
+    result = c_exec('breakpoint()')
+    assert result.errors == ('Line 1: "breakpoint" is a reserved name.',)
+    assert result.code is None