如題，是在一個案例的for循環中，if執行了，按理elif不應該執行，但是結果依然執行了elif，不太理解，是忽略了什么嗎

for msg in track:

print '-----------------------------------------------------'

print "the msg is {} \n".format(msg)

print '\n'

if isinstance(msg, midi.EndOfTrackEvent):

print "end of track!!pass!!"

continue

if msg.tick > 0:

print '##msg.tick > 0 !!!'

current_tick += msg.tick

print 'current_tick plus {} tick!'.format(msg.tick)

print current_tick

print msg.tick

if isinstance(msg, midi.NoteOnEvent) and msg.get_velocity() != 0:

if len(notes[msg.get_pitch()]) > 0 and len(notes[msg.get_pitch()][-1]) != 2:

if verbose:

print("double NoteOn encountered,delete the first")

print "the msg double note_on msg is {} \n".format(msg)

print "the pitch is {}".format(msg.get_pitch())

else:

notes[msg.get_pitch()] += [[current_tick]]

print notes[msg.get_pitch()]

print [[current_tick]]

print '#####this is noteonevent,,,the current_tick plus {} #####\n'.format(msg.get_pitch)

# print 'the cu'

elif isinstance(msg, midi.NoteOffEvent) or (isinstance(msg, midi.NoteOnEvent) and msg.get_velocity() == 0):

if len(notes[msg.get_pitch()][-1]) != 1:

if verbose:

print ("warning:skipping noteoff event with no corresponding noteon")

print (msg)

else:

notes[msg.get_pitch()][-1] += [current_tick]

print "the current_tick plus {} \n".format(notes[msg.get_pitch()][-1])

print notes[msg.get_pitch()][-1]

print [current_tick]

總結

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