Here is what I answered for a similar question:
The new line, \n, is inserted inside the StreamHandler class's emit(...) method.
If you're really set on fixing this behaviour, then here's an example of how I solved this by monkey patching the emit(self, record) method inside the logging.StreamHandler class.
A monkey patch is a way to extend or modify the run-time code of dynamic languages without altering the original source code. This process has also been termed duck punching.
Here is the custom implementation of emit() that omits line breaks:
def customEmit(self, record):
# Monkey patch Emit function to avoid new lines between records
try:
msg = self.format(record)
if not hasattr(types, "UnicodeType"): #if no unicode support...
self.stream.write(msg)
else:
try:
if getattr(self.stream, 'encoding', None) is not None:
self.stream.write(msg.encode(self.stream.encoding))
else:
self.stream.write(msg)
except UnicodeError:
self.stream.write(msg.encode("UTF-8"))
self.flush()
except (KeyboardInterrupt, SystemExit):
raise
except:
self.handleError(record)
Then you would make a custom logging class (in this case, subclassing from TimedRotatingFileHandler).
class SniffLogHandler(TimedRotatingFileHandler):
def __init__(self, filename, when, interval, backupCount=0,
encoding=None, delay=0, utc=0):
# Monkey patch 'emit' method
setattr(StreamHandler, StreamHandler.emit.__name__, customEmit)
TimedRotatingFileHandler.__init__(self, filename, when, interval,
backupCount, encoding, delay, utc)
Some people might argue that this type of solution is not Pythonic, or whatever. It might be so, so be careful.
Also, be aware that this will globally patch SteamHandler.emit(...), so if you are using multiple logging classes, then this patch will affect the other logging classes as well!
Hope that helps.
