擅长:python、mysql、java
<p>通过添加一些字符串格式解决:</p>
<pre class="lang-py prettyprint-override"><code>total = 0
with open('lab07_python.txt', 'r') as orig:
lines = orig.readlines()
for line in lines:
total = total +1
new = '%d %s' % (total, line)
david.write(new)
</code></pre>