Refactor logging to be a package, instead of a module

freqtrade/loggers/std_err_stream_handler.py

@@ -0,0 +1,26 @@
+import sys
+from logging import Handler
+
+
+class FTStdErrStreamHandler(Handler):
+    def flush(self):
+        """
+        Override Flush behaviour - we keep half of the configured capacity
+        otherwise, we have moments with "empty" logs.
+        """
+        self.acquire()
+        try:
+            sys.stderr.flush()
+        finally:
+            self.release()
+
+    def emit(self, record):
+        try:
+            msg = self.format(record)
+            # Don't keep a reference to stderr - this can be problematic with progressbars.
+            sys.stderr.write(msg + '\n')
+            self.flush()
+        except RecursionError:
+            raise
+        except Exception:
+            self.handleError(record)