change default type of file parameter to None and use stdout if None

pprintjson/pprintjson.py

@@ -1,20 +1,22 @@
 """pprintjson module"""
 
-from sys import stdout, argv
 from json import dumps, loads
+from sys import stdout, argv
+from typing import Dict, IO, List, Union
+
 from pygments import highlight
-from pygments.lexers import JsonLexer
 from pygments.formatters import TerminalFormatter
-from typing import Dict, IO, List, Union
+from pygments.lexers import JsonLexer
 
 
 def pprintjson(
     obj: Union[Dict, List],
     indent: int = 4,
     end: str = "\n",
-    file: IO = stdout,
+    file: IO = None,
     flush: bool = False,
 ) -> None:
+    file = stdout if file is None else file
     json = dumps(obj, indent=indent)
     if file.isatty():
         json = highlight(json, JsonLexer(), TerminalFormatter())