469,645 Members | 1,733 Online
Bytes | Developer Community
New Post

Home Posts Topics Members FAQ

Post your question to a community of 469,645 developers. It's quick & easy.

error in ConfigParser

Hello everyone:

I came across the module ConfigParser and can use it correctly.

import ConfigParser
fp = open('test.cfg','w+')
config = ConfigParser.ConfigParser()
config.readfp(fp)
config.add_section('test')
config.set('test', 'haha', 'hehe')
print config.sections()
config.write(fp)

['test']
Traceback (most recent call last):
File "configparser.py", line 8, in ?
config.write(fp)
File "C:\Python24\lib\ConfigParser.py", line 369, in write
fp.write("[%s]\n" % section)
IOError: (0, 'Error')

I trace into the module and when executing the line "fp.write("[%s]\n"
% section)", I find every parameter is correct: fp is still a open file
object and section is 'test', I may miss something, but I just cannot
figure it out. Can someone tell me what's going wrong here?

Thanks

Jun 28 '06 #1
1 1836
pipehappy wrote:
Hello everyone:

I came across the module ConfigParser and can use it correctly.

import ConfigParser
fp = open('test.cfg','w+')
config = ConfigParser.ConfigParser()
config.readfp(fp)
config.add_section('test')
config.set('test', 'haha', 'hehe')
print config.sections()
config.write(fp)

['test']
Traceback (most recent call last):
File "configparser.py", line 8, in ?
config.write(fp)
File "C:\Python24\lib\ConfigParser.py", line 369, in write
fp.write("[%s]\n" % section)
IOError: (0, 'Error')

I trace into the module and when executing the line "fp.write("[%s]\n"
% section)", I find every parameter is correct: fp is still a open file
object and section is 'test', I may miss something, but I just cannot
figure it out. Can someone tell me what's going wrong here?

What is the exact intent of your code? Note that the "w+" mode is
documented as truncating the file, which means that your starting
configuration will always be null. My first thoughts were therefore
related to file position,

For what it's worth, however, note that on my system (Cygwin 2.4.3) this
code only breaks the *second* time:
import ConfigParser
fp = open('test.cfg','w+')
config = ConfigParser.ConfigParser()
config.readfp(fp)
config.add_section('test')
config.set('test', 'haha', 'hehe')
print config.sections() ['test'] config.write(fp)
### should really have closed fp here?
import ConfigParser
fp = open('test.cfg','w+')
config = ConfigParser.ConfigParser()
config.readfp(fp)
config.add_section('test') Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "/usr/lib/python2.4/ConfigParser.py", line 226, in add_section
raise DuplicateSectionError(section)
ConfigParser.DuplicateSectionError: Section 'test' already exists config.set('test', 'haha', 'hehe')
print config.sections() ['test'] config.write(fp)


Adding a seel to the start of the file before the failing statement
seems to fix the problem, so I guess my conjecture was right. Try

import ConfigParser
fp = open('test.cfg','w+')
config = ConfigParser.ConfigParser()
config.readfp(fp)
config.add_section('test')
config.set('test', 'haha', 'hehe')
print config.sections()
fp.seek(0)
config.write(fp)
fp.close()

But then fix that "w+" if this is more than just a test app!

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Love me, love my blog http://holdenweb.blogspot.com
Recent Ramblings http://del.icio.us/steve.holden

Jun 28 '06 #2

This discussion thread is closed

Replies have been disabled for this discussion.

Similar topics

3 posts views Thread by Greg Krohn | last post: by
1 post views Thread by Martin Maney | last post: by
2 posts views Thread by Roy H. Berger | last post: by
6 posts views Thread by Matthew Barnes | last post: by
11 posts views Thread by Manlio Perillo | last post: by
2 posts views Thread by rzed | last post: by
10 posts views Thread by Terry Carroll | last post: by
4 posts views Thread by Phoe6 | last post: by
By using this site, you agree to our Privacy Policy and Terms of Use.