Add upload-pypi option to disable upload to Pypi

zest/releaser/pypi.py

@@ -467,6 +467,19 @@ def create_wheel(self):
             return False
         return self.config.get("create-wheel", True)
 
+    def upload_pypi(self):
+        """Should we upload the package to Pypi?
+
+        [Configure this mode by adding a ``upload-pypi`` option::
+
+            [zest.releaser]
+            upload-pypi = no
+
+        The default when this option has not been set is True.
+
+        """
+        return self._get_boolean('zest.releaser', 'upload-pypi', default=True)
+
     def register_package(self):
         """Should we try to register this package with a package server?
 

zest/releaser/release.py

@@ -155,6 +155,9 @@ def _upload_distributions(self, package):
                 self.data["tagworkingdir"],
             )
             builder.build("wheel", "./dist/")
+        if not self.pypiconfig.upload_pypi():
+            logger.info("Upload to Pypi was disabled in configuration.")
+            return
         if not self.pypiconfig.is_pypi_configured():
             logger.error(
                 "You must have a properly configured %s file in "