擅长:python、mysql、java
<p>在python中:</p>
<pre class="lang-py prettyprint-override"><code>line = r'gentlemen, this is a block of text. Thanks!,1,0,0,1'
num_commas = 4
comma_count = 0
for c in reversed(line):
from_end += 1
if c == ',':
comma_count += 1
if comma_count >= num_commas:
break
line[:-from_end]
# 'gentlemen, this is a block of text. Thanks!'
</code></pre>
<p>其余的都是学术性的</p>