擅长:python、mysql、java
<p>假设你可以一次读取整个文件</p>
<pre><code>s=DNAstring.replace("\n","") # first remove the nasty linebreaks
l=[x for x in s.split("N") if x] # split and drop empty lines
for x in l: # print in chunks
while x:
print x[:10]
x=x[10:]
print # extra linebreak between chunks
</code></pre>