Initial revision

.gitignore

+
+# Created by https://www.gitignore.io/api/python
+# Edit at https://www.gitignore.io/?templates=python
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# Mr Developer
+.mr.developer.cfg
+.project
+.pydevproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# End of https://www.gitignore.io/api/python

my2to3/__main__.py

+from lib2to3.main import main
+import sys
+
+
+sys.exit(main('my2to3.fixers'))

my2to3/fixers/fix_rewrite_div.py

+# https://lab.nexedi.com/nexedi/erp5/snippets/475
+import lib2to3.fixer_base
+import lib2to3.fixer_util
+import lib2to3.pgen2
+import sys
+
+
+class FixRewriteDiv(lib2to3.fixer_base.BaseFix):
+  """Rewrites a/b into division_traced(a, b)
+
+  division_traced can be a function that looks up the stack and record the operand types, for example:
+
+      def division_traced(dividend, divisor):
+        import inspect
+        previous_frame = inspect.currentframe().f_back
+        print ("{}:{} {} / {}".format(
+            previous_frame.f_code.co_filename,
+            previous_frame.f_lineno,
+            type(dividend),
+            type(divisor)
+        ))
+        return dividend / divisor
+
+      import __builtin__
+      __builtin__.division_traced = division_traced
+
+  """
+
+  def match(self, node):
+    return (
+        len(node.children) == 3 and
+        node.children[1].type == lib2to3.pgen2.token.SLASH)
+
+  def transform(self, node, results):
+    node.replace(
+        lib2to3.fixer_util.Call(
+            lib2to3.fixer_util.Name("division_traced"),
+            args=(
+                node.children[0].clone(),
+                lib2to3.fixer_util.Comma(),
+                node.children[2].clone(),
+            ),
+            prefix=node.prefix))