Factor out get_config and get_credentials.

In general, we have cyclic import issues all over the place, this is one
easy fix and will help out in later commits.

Note that this maintains backwards compat due to how the the functions
are imported into `plotly.py`.

Author: theengineear

Diff for: plotly/config.py

@@ -0,0 +1,35 @@
+"""
+Merges and prioritizes file/session config and credentials.
+
+This is promoted to its own module to simplify imports.
+
+"""
+from __future__ import absolute_import
+
+from plotly import session, tools
+
+
+def get_credentials():
+    """Returns the credentials that will be sent to plotly."""
+    credentials = tools.get_credentials_file()
+    session_credentials = session.get_session_credentials()
+    for credentials_key in credentials:
+
+        # checking for not false, but truthy value here is the desired behavior
+        session_value = session_credentials.get(credentials_key)
+        if session_value is False or session_value:
+            credentials[credentials_key] = session_value
+    return credentials
+
+
+def get_config():
+    """Returns either module config or file config."""
+    config = tools.get_config_file()
+    session_config = session.get_session_config()
+    for config_key in config:
+
+        # checking for not false, but truthy value here is the desired behavior
+        session_value = session_config.get(config_key)
+        if session_value is False or session_value:
+            config[config_key] = session_value
+    return config

Diff for: plotly/plotly/plotly.py

@@ -35,6 +35,9 @@
                             get_session_config)
 from plotly.grid_objs import Grid, Column
 
+# This is imported like this for backwards compat. Careful if changing.
+from plotly.config import get_config, get_credentials
+
 __all__ = None
 
 DEFAULT_PLOT_OPTIONS = {
@@ -55,32 +58,6 @@
 update_plot_options = update_session_plot_options
 
 
-def get_credentials():
-    """Returns the credentials that will be sent to plotly."""
-    credentials = tools.get_credentials_file()
-    session_credentials = get_session_credentials()
-    for credentials_key in credentials:
-
-        # checking for not false, but truthy value here is the desired behavior
-        session_value = session_credentials.get(credentials_key)
-        if session_value is False or session_value:
-            credentials[credentials_key] = session_value
-    return credentials
-
-
-def get_config():
-    """Returns either module config or file config."""
-    config = tools.get_config_file()
-    session_config = get_session_config()
-    for config_key in config:
-
-        # checking for not false, but truthy value here is the desired behavior
-        session_value = session_config.get(config_key)
-        if session_value is False or session_value:
-            config[config_key] = session_value
-    return config
-
-
 def _plot_option_logic(plot_options_from_call_signature):
     """
     Given some plot_options as part of a plot call, decide on final options.