get the amount of Chinese character in a string

get_length.py

import sys

# Use the property:
# Almost every Chinese character is 3 bytes in UTF-8

""" 
# bytes length check
for line in open(sys.argv[1], "r"):
  parts = line.rstrip('\r\n').split('\t')
	if len(parts[0].strip()) <= 3:
		print line.rstrip('\r\n')
"""

# check chinese character amount in a keyword
for line in open(sys.argv[1], "r"):
	parts = line.split('\t')
	try:
		ch_num = len(parts[0].strip()) - len(unicode(parts[0].strip(), 'gbk'))
	except:
		continue
	if ch_num > 2:
		print line.rstrip('\r\n')