Allow the YAML library to choose the flow style automatically. This r…

…esults in more human-friendly outputs.

yakut/param/formatter.py

@@ -88,10 +88,7 @@ def _unittest_formatter() -> None:
     obj = {
         2345: {
             "abc": {
-                "def": [
-                    123,
-                    456,
-                ],
+                "def": [123, 456],
             },
             "ghi": 789,
         }
@@ -101,9 +98,7 @@ def _unittest_formatter() -> None:
         == """---
 2345:
   abc:
-    def:
-    - 123
-    - 456
+    def: [123, 456]
   ghi: 789
 """
     )

yakut/yaml.py

@@ -17,14 +17,16 @@
 class YAMLDumper:
     """
     YAML generation facade.
+    Natively represents decimal.Decimal as floats in the output.
     """
 
     def __init__(self, explicit_start: bool = False):
         # We need to use the roundtrip representer to retain ordering of mappings, which is important for usability.
         self._impl = ruamel.yaml.YAML(typ="rt")
         # noinspection PyTypeHints
         self._impl.explicit_start = explicit_start
-        self._impl.default_flow_style = False
+        self._impl.default_flow_style = None  # Choose between block/inline automatically
+        self._impl.width = 2 ** 31  # Unlimited width
 
     def dump(self, data: typing.Any, stream: typing.TextIO) -> None:
         self._impl.dump(data, stream)
@@ -38,7 +40,6 @@ def dumps(self, data: typing.Any) -> str:
 class YAMLLoader:
     """
     YAML parsing facade.
-    Natively represents decimal.Decimal as floats in the output.
     """
 
     def __init__(self) -> None:
@@ -85,7 +86,7 @@ def _unittest_yaml() -> None:
 abc: -.inf
 def:
 - .nan
-- qaz: 789.0
+- {qaz: 789.0}
 """
     )
     assert YAMLLoader().load(ref) == {