#!/usr/bin/python
# coding:utf-8
file = open("shmel.txt", "w")
for line in open("test.mpt"):
    s = line.split()
    if s[0]=="<note":
		k=s[2][5:]
		k=k[:(len(k)-1)]
		k=int(k)
		p=s[4][5:]
		p=p[:(len(p)-1)]
		p=int(p)		
		l=s[5][5:]
		l=l[:(len(l)-3)]
		l=int(l)
		file.write("%s %s %s\n"%(k,p,l))		
		print (k,p,l)
file.close()

#!/usr/bin/env python
#-*- coding: utf8 -*-

from lxml import etree

def parse_mpt(name):
    root = etree.parse(name)
    notes = root.xpath('//pattern/note')
    return [(n.get('key'), n.get('pos'), n.get('len')) for n in notes]

parsed = parse_mpt('test.mpt')

buf = '\n'.join([' '.join(e) for e in parsed])

with open('shmel.txt', 'w') as fd:
    fd.write(buf)

          <note pan="0" key="52" vol="123" pos="10368" len="12"/>
          <note pan="0" key="52" vol="123" pos="10368" len="12"/>

52 10368 12
52 10368 12

>grep "<note" test.mpt | wc -l
889
>python inp.py test.mpt | wc -l
889

#!/usr/bin/python
# coding:utf-8
c = 0
for line in open("test.mpt"):
    s = line.split()
    if s[0]=="<note":
        c += 1
print c
>python inp.py
889

945    <note pan="0" key="52" vol="123" pos="10368" len="12"/>
946   <note pan="0" key="52" vol="123" pos="10368" len="12"/>