A case id can now be a reserved keyword without triggering any `Synta…

…xError`, even if the case is transformed into a fixture. Fixes #230

docs/changelog.md

@@ -1,5 +1,9 @@
 # Changelog
 
+### 3.6.4 - Bugfix
+
+- A case id can now be a reserved keyword without triggering any `SyntaxError`, even if the case is transformed into a fixture. Fixes [#230](https://github.com/smarie/python-pytest-cases/issues/230)
+
 ### 3.6.3 - Bugfix
 
  - Fixed an issue where a lazy value would not be resolved. This happens when the "auto-simplify fixture" happens in `@parametrize`. Fixes [#225](https://github.com/smarie/python-pytest-cases/issues/225)

pytest_cases/common_others.py

@@ -4,6 +4,7 @@
 # License: 3-clause BSD, <https://github.com/smarie/python-pytest-cases/blob/master/LICENSE>
 import functools
 import inspect
+from keyword import iskeyword
 import makefun
 from importlib import import_module
 from inspect import findsource
@@ -553,7 +554,12 @@ def make_identifier(name  # type: str
     """Transform the given name into a valid python identifier"""
     if not isinstance(name, string_types):
         raise TypeError("name should be a string, found : %r" % name)
-    elif isidentifier(name):
+
+    if iskeyword(name):
+        # reserved keywords: add an underscore
+        name = name + "_"
+
+    if isidentifier(name):
         return name
     elif len(name) == 0:
         # empty string

pytest_cases/tests/cases/issues/test_issue_230.py

@@ -0,0 +1,18 @@
+from pytest_cases import parametrize_with_cases
+
+
+class FooCases:
+
+    def case_None(self, tmpdir):
+        return 1
+
+    def case_True(self, tmpdir):
+        return 1
+
+    def case_False(self, tmpdir):
+        return 1
+
+
+@parametrize_with_cases("foo", cases=FooCases)
+def test_issue_230(foo):
+    pass