擅长:python、mysql、java
<p>{cd1>您可以在这里帮助您:</p>
<pre><code>In [9]: re.sub ?
Type: function
Base Class: <type 'function'>
String Form:<function sub at 0x00AC7CF0>
Namespace: Interactive
File: c:\python27\lib\re.py
Definition: re.sub(pattern, repl, string, count=0, flags=0)
Docstring:
Return the string obtained by replacing the leftmost
non-overlapping occurrences of the pattern in string by the
replacement repl. repl can be either a string or a callable;
if a string, backslash escapes in it are processed. If it is
a callable, it's passed the match object and must return
a replacement string to be used.
In [13]: a = "bbbbbbb"
In [14]: x = re.sub('b', 'a', a, count=3)
In [15]: x
Out[15]: 'aaabbbb'
</code></pre>