Python \r\n与\n的转换-白红宇

Python \r\n与\n的转换
阅读量：795 次
发布时间：2023-03-06
本文共 5027 字，大约阅读时间需要 16 分钟。
原文链接[脚本之家](http://www.jb51.net/article/64669.htm)
                            
import
os
def
replace(filePath, w2u):
  
try
:
    
oldfile 
=
open
(filePath, 
"rb+"
)     
#这里必须用b打开
    
path, name 
=
os.path.split(filePath)
    
newfile 
=
open
(path 
+
'$'</code> <code class="py keyword">+</code> <code class="py plain">name, </code><code class="py string">"ba+"</code><code class="py plain">)</code></div><div class="line number8 index7 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</div><div class="line number9 index8 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">old </code><code class="py keyword">=</code> <code class="py plain">b''</code></div><div class="line number10 index9 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">new </code><code class="py keyword">=</code> <code class="py plain">b''</code></div><div class="line number11 index10 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py keyword">if</code> <code class="py plain">w2u </code><code class="py keyword">=</code><code class="py keyword">=</code> <code class="py color1">True</code><code class="py plain">:</code></div><div class="line number12 index11 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">old </code><code class="py keyword">=</code> <code class="py plain">b</code><code class="py string">'\r'</code></div><div class="line number13 index12 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">new </code><code class="py keyword">=</code> <code class="py plain">b''</code></div><div class="line number14 index13 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py keyword">else</code><code class="py plain">:</code></div><div class="line number15 index14 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">old </code><code class="py keyword">=</code> <code class="py plain">b</code><code class="py string">'\n'</code></div><div class="line number16 index15 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">new </code><code class="py keyword">=</code> <code class="py plain">b</code><code class="py string">'\r\n'</code></div><div class="line number17 index16 alt2">&nbsp;</div><div class="line number18 index17 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">data </code><code class="py keyword">=</code> <code class="py plain">b''</code></div><div class="line number19 index18 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py keyword">while</code> <code class="py plain">(</code><code class="py color1">True</code><code class="py plain">):</code></div><div class="line number20 index19 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">data </code><code class="py keyword">=</code> <code class="py plain">oldfile.read(</code><code class="py value">200</code><code class="py plain">)</code></div><div class="line number21 index20 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">newData </code><code class="py keyword">=</code> <code class="py plain">data.replace(old, new)</code></div><div class="line number22 index21 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">newfile.write(newData)</code></div><div class="line number23 index22 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py keyword">if</code> <code class="py functions">len</code><code class="py plain">(data) &lt; </code><code class="py value">200</code><code class="py plain">:</code></div><div class="line number24 index23 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py keyword">break</code></div><div class="line number25 index24 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">newfile.close()</code></div><div class="line number26 index25 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">oldfile.close()</code></div><div class="line number27 index26 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp;</div><div class="line number28 index27 alt1"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">os.remove(filePath)</code></div><div class="line number29 index28 alt2"><code class="py spaces">&nbsp;&nbsp;&nbsp;&nbsp;</code><code class="py plain">os.rename(path </code><code class="py keyword">+</code> <code class="py string">'$'
+
name, filePath)
  
except
IOError as e:
    
print
(e)
    
if
__name__ 
=
=
"__main__"
:
  
print
(
"请输入文件路径："
)
  
filePath 
=
input
()
  
replace(filePath, 
False
)  
#这个改为True就可以实现\n变成\r\n
         
       
要注意的是，在python里，像\r\n这样的符号，如果是文本打开的话，是找不到\r\n的，而只能找到’\n’，所以必须用b（二进制）模式打开。
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