擅长:python、mysql、java
<p>您可以一次读取所有文件,并将regex应用于数据,然后将修改后的数据写入另一个文件,如下所示:</p>
<pre><code>import re
with open('input-file.xml') as fd:
data = fd.read()
regex = re.compile('(<ele>)([\d.]+)(</ele>)')
while True:
match = regex.search(data)
if not match:
break
new_value = float(match.group(2)) + 30
# <ele>6373.8</ele> becomes </ele>6373.8<ele> so that it doesnt match again
data = regex.sub(r'\g<3>{}\g<1>'.format(new_value), data, count=1)
# undo </ele>...<ele> the tag reversal done inside the while loop
regex = re.compile('(</ele>)([\d.]+)(<ele>)')
data = regex.sub(r'\3\2\1', data)
with open('output-file.xml', 'w') as fd:
fd.write(data)
</code></pre>