add @amueller's examples from scikit-learn/scikit-learn#78 (comment)

amueller_examples/example_1.py

@@ -0,0 +1,19 @@
+import logging
+from pprint import pprint
+
+from joblib import Parallel, delayed
+
+logger = logging.getLogger("sklearn")
+logger.setLevel(2)
+pprint(logging.Logger.manager.loggerDict)
+
+
+def get_level():
+    pprint(logging.Logger.manager.loggerDict)
+    another_logger = logging.getLogger("sklearn")
+    return another_logger.level
+
+
+results = Parallel(n_jobs=2)(delayed(get_level)() for _ in range(2))
+
+print(results)

amueller_examples/example_2.py

@@ -0,0 +1,24 @@
+import logging
+import os
+import sys
+
+from joblib import Parallel, delayed
+
+logger = logging.getLogger("sklearn")
+logger.setLevel("DEBUG")
+
+handler = logging.StreamHandler(sys.stdout)
+logger.addHandler(handler)
+
+print(os.getpid(), logger, logger.handlers)
+
+
+def log_some():
+    print(os.getpid(), logger, logger.handlers)
+    another_logger = logging.getLogger("sklearn")
+    print(os.getpid(), another_logger, another_logger.handlers)
+    print(os.getpid(), logging.getLogger(), logging.getLogger().handlers)
+    another_logger.critical("hello from joblib process")
+
+
+results = Parallel(n_jobs=2)(delayed(log_some)() for _ in range(2))