Use recommended dictConfig for logging configuration (#850)

.gitignore

@@ -7,7 +7,6 @@
 *jpg
 *pdf
 *zip
-*json
 
 # Apple file system
 *.DS_STORE

pyam/logging.json

@@ -0,0 +1,24 @@
+{
+    "version": 1,
+    "disable_existing_loggers": false,
+    "formatters": {
+      "generic": {
+        "format": "[%(levelname)s] %(asctime)s - %(name)s: %(message)s",
+        "datefmt": "%H:%M:%S"
+      }
+    },
+    "loggers": {
+      "pyam": {
+        "level": "INFO",
+        "handlers": ["console"]
+      }
+    },
+    "handlers": {
+      "console": {
+        "class": "logging.StreamHandler",
+        "level": "NOTSET",
+        "formatter": "generic"
+      }
+    }
+  }
+

pyam/logging.py

@@ -1,3 +1,4 @@
+import json
 import warnings
 from contextlib import contextmanager
 from logging import config, getLogger
@@ -11,7 +12,9 @@
 
 def configure_logging():
     """Configure logging"""
-    config.fileConfig(here / "logging.conf", disable_existing_loggers=False)
+    logging_config = here / "logging.json"
+    with open(logging_config) as file:
+        config.dictConfig(json.load(file))
 
 
 @contextmanager