Use Black to format Python parameters for versions >= 3.6 (#455)

Use black for Python >= 3.6

papermill/translators.py

@@ -135,6 +135,16 @@ def translate_list(cls, val):
     def comment(cls, cmt_str):
         return '# {}'.format(cmt_str).strip()
 
+    @classmethod
+    def codify(cls, parameters):
+        content = super(PythonTranslator, cls).codify(parameters)
+        if sys.version_info >= (3, 6):
+            # Put content through the Black Python code formatter
+            import black
+            fm = black.FileMode(string_normalization=False)
+            content = black.format_str(content, mode=fm)
+        return content
+
 
 class RTranslator(Translator):
     @classmethod

requirements-dev.txt

@@ -9,7 +9,6 @@ pytest-env>=0.6.2
 ipython>=5.0
 moto
 check-manifest
-black; python_version >= '3.6'
 attrs>=17.4.0
 pre-commit
 boto3

requirements.txt

@@ -12,3 +12,4 @@ jupyter_client
 requests
 entrypoints
 tenacity
+black; python_version >= '3.6'