<p>这里有一个不使用正则表达式的脚本</p>
<ul>
<li><p>它假设标题行,并且只有标题行,总是以数字开头,并且标题行和信用额度的整体结构是一致的。空行将被忽略</p>
</li>
<li><p>轨迹数据的提取和格式化是分开处理的,因此更容易更改格式,或以其他方式使用提取的数据</p>
</li>
</ul>
<pre class="lang-py prettyprint-override"><code>import collections
import unicodedata
data_from_question = """\
1. Track1 03:01
VOC:PersonA
LYR:LyrcistA
COM:ComposerA
ARR:ArrangerA
ARR:ArrangerB
2. Track2 04:18
VOC:PersonB
VOC:PersonC
LYR:LyrcistA
LYR:LyrcistC
COM:ComposerA
ARR:ArrangerA
"""
def prepare_data(data):
# The "colons" in the credits lines are actually
# "full width colons". Replace them (and other such characters)
# with their normal width equivalents.
# If full normalisation is undesirable then we could return
# data.replace('\N{FULLWIDTH COLON}', ':')
return unicodedata.normalize('NFKC', data)
def is_new_track(line):
return line[0].isdigit()
def parse_track_header(line):
id_, title, duration = line.split()
return {'id': id_.rstrip('.'), 'title': title, 'duration': duration}
def get_credit(line):
credit, _, name = line.partition(':')
return credit.strip(), name.strip()
def format_track_heading(track):
return 'id: {id} title: {title} length: {duration}'.format(**track)
def format_credits(track):
order = ['ARR', 'COM', 'LYR', 'VOC']
parts = ['; '.join(track[k]) for k in order]
return ' - '.join(parts)
def get_data():
# The data is expected to be a multiline string.
return data_from_question
def parse_data(data):
track = None
for line in filter(None, data.splitlines()):
if is_new_track(line):
if track:
yield track
track = collections.defaultdict(list)
header_data = parse_track_header(line)
track.update(header_data)
else:
role, name = get_credit(line)
track[role].append(name)
yield track
def report(tracks):
for track in tracks:
print(format_track_heading(track))
print(format_credits(track))
print()
def main():
data = get_data()
prepared_data = prepare_data(data)
tracks = parse_data(prepared_data)
report(tracks)
main()
</code></pre>
<p>输出:</p>
<pre class="lang-none prettyprint-override"><code>id: 1 title: Track1 length: 03:01
ArrangerA; ArrangerB - ComposerA - LyrcistA - PersonA
id: 2 title: Track2 length: 04:18
ArrangerA - ComposerA - LyrcistA; LyrcistC - PersonB; PersonC
</code></pre>