Read the windows event log

[Austin]

My codes are below:

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import win32evtlog

def check_records(records):
    for i in range(0,len(records)):
        print records[i].SourceName

h = win32evtlog.OpenEventLog(None,"System")
flags = 
win32evtlog.EVENTLOG_BACKWARD_READ|win32evtlog.EVENTLOG_SEQUENTIAL_READ
records = win32evtlog.ReadEventLog(h,flags,0)

print "Total " + str(len(records))
check_records(records)

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The result from my codes are total 2.
But the event log in windows event viewer are 24.
How could I get all events?