python regex replace返回一个额外的\\ n

Question

I am trying to replace some text in a file with python 2.6

However, it returns an extra newline here is my code:

for line in fileinput.input('/etc/php5/apache2/php.ini', inplace=True):
   replace = re.sub(r'(post_max_size =).[0-9]+(M)', r'\1 64\2', line)
   print replace

Input:

post_max_size = 6M
sdfsdfsd
post_max_size = 4M
sdfsdf
post_max_size = 164M
dfsdfsdfsdfsdf

output:

post_max_size = 64M

sdfsdfsd

post_max_size = 64M

sdfsdf

post_max_size = 64M

dfsdfsdfsdfsdf

Answer 1

The extra output you are seing is from print , if you write the file back out, you should not see the extra line breaks.

Try it with this: print replace,

This is a minor point, but you should also pick a different name, as replace is the name for a method in the standard library for strings.

Answer 2

your regex is fine. print adds newline. use write instead.

Answer 3

Try: print replace, instead. The trailing comma suppresses the newline (but adds a trailing space). For complete control use the print function from __future__ instead.