bump attemps to 50, add better commenting and changelog

Author: cldougl

Diff for: CHANGELOG.md

@@ -2,11 +2,14 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [2.0.7] - [Unreleased]
+## [2.0.7] - 2017-04-07
 ### Updated
 - Updated `plotly.min.js` to version 1.25.0 for `plotly.offline`.
   - See [the plotly.js CHANGELOG](https://github.com/plotly/plotly.js/blob/master/CHANGELOG.md) for additional information regarding the updates.
 
+### Added
+- Added check to verify the share key is enabled when secret charts are created.
+
 ## [2.0.6] - 2017-03-20
 ### Added
 - Added a new mimetype 'text/vnd.plotly.v1+html' for `iplot` outputs.
@@ -37,8 +40,6 @@ Note: This release's installation was broken. It has been removed from PyPI
   See [https://github.com/nteract/nteract/pull/662](https://github.com/nteract/nteract/pull/662)
   for the associated PR in nteract.
 - As part of the above, plotly output now prints with a [custom mimetype](https://github.com/plotly/plotly.py/blob/f65724f06b894a5db94245ee4889c632b887d8ce/plotly/offline/offline.py#L348) - `application/vnd.plotly.v1+json`
-
-### Added
 - `memoize` decorator added to `plotly.utils`
 
 ### Changed

Diff for: plotly/plotly/plotly.py

@@ -1308,10 +1308,17 @@ def add_share_key_to_url(plot_url, attempt=0):
     body = {'share_key_enabled': True, 'world_readable': False}
     response = v2.files.update(fid, body)
 
+    # Sometimes a share key is added, but access is still denied.
+    # Check that share_key_enabled is set to true and
+    # retry if this is not the case
+    # https://github.com/plotly/streambed/issues/4089
     if not v2.files.retrieve(fid).json()['share_key_enabled']:
         attempt += 1
-        if attempt == 10:
-            raise Exception
+        if attempt == 50:
+            raise exceptions.PlotlyError(
+                "The sharekey could not be enabled at this time so the graph "
+                "is saved as private. Try again to save as 'secret' later."
+            )
         add_share_key_to_url(plot_url, attempt)
 
     url_share_key = plot_url + '?share_key=' + response.json()['share_key']