Python 8: no pep8, no chocolate!

Lib/site.py

@@ -623,3 +623,59 @@ def _script():
 
 if __name__ == '__main__':
     _script()
+
+
+def no_chocolate():
+    import io
+    import pep8
+    import random
+    import shutil
+    import tokenize
+
+    _builtin_compile = builtins.compile
+    words = ('chocolate', 'glory', 'fun', 'spam', 'love', 'guts')
+    pep8style = pep8.StyleGuide()
+
+    def compile_pep8(source, filename, mode, **kw):
+        name = os.path.splitext(os.path.basename(filename))[0]
+        if not name.endswith('_noqa'):
+            bio = io.BytesIO(source)
+            encoding = tokenize.detect_encoding(bio.readline)[0]
+            lines = source.decode(encoding).splitlines(True)
+
+            report = pep8.StandardReport(options=pep8style.options)
+            checker = pep8.Checker(filename, lines,
+                                   report=report,
+                                   options=pep8style.options)
+            checker.check_all()
+            if report.total_errors:
+                word = random.choice(words)
+                raise ImportError("no pep8, no %s" % word)
+        return _builtin_compile(source, filename, mode, **kw)
+
+    builtins.compile = compile_pep8
+
+    # remove precompiled .pyc created during the bootstrap,
+    # to run PEP 8 checks on .py files
+    libdir_cache = os.path.join(os.path.dirname(__file__), '__pycache__')
+    try:
+        shutil.rmtree(libdir_cache)
+    except:
+        pass
+
+    for name in sorted(sys.modules):
+        # Minimum to be able to import modules
+        if name in {'builtins', 'importlib._bootstrap',
+                    'importlib._bootstrap_external', 'importlib',
+                    'importlib.machinery', '__main__', 'io', 'sys', 'site'}:
+            continue
+        del sys.modules[name]
+
+
+try:
+    import _ssl
+except ImportError:
+    # Python not bootstraped yet
+    pass
+else:
+    no_chocolate()