Merge pull request #317 from zakandrewking/python-3.5

Support Python 3.5

.travis.yml

@@ -1,6 +1,8 @@
 dist: xenial
 language: python
 python:
+  - "3.5"
+  - "3.6"
   - "3.7"
 # Latest node
 before_install:

py/escher/plots.py

@@ -68,7 +68,8 @@ def match_in_index(name, index, kind):
         raise Exception('Could not connect to the Escher server')
     match = match_in_index(name, server_index(), kind)
     if len(match) == 0:
-        raise Exception(f'Could not find the {kind} {name} on the server')
+        raise Exception('Could not find the {kind} {name} on the server'
+                        .format(kind=kind, name=name))
     org, name = match[0]
     url = (
         get_url(kind + '_download') +
@@ -526,7 +527,7 @@ def __init__(
             model: Model = None,
             model_name: str = None,
             model_json: str = None,
-            **kwargs,
+            **kwargs
     ) -> None:
         # kwargs will instantiate the traitlets
         super().__init__(**kwargs)

py/escher/tests/test_plots.py

@@ -72,7 +72,8 @@ def look_for_string(st, substring):
         found = st.find(substring)
         assert found > -1
     except AssertionError:
-        raise AssertionError(f'Could not find\n\n{substring}\n\nin\n\n{st}')
+        raise AssertionError('Could not find\n\n{substring}\n\nin\n\n{st}'
+                             .format(substring=substring, st=st))
 
 
 def test_save_html(tmpdir):

py/setup.py

@@ -24,6 +24,7 @@
         'Topic :: Scientific/Engineering',
         'Topic :: Scientific/Engineering :: Visualization',
         'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Operating System :: OS Independent'