write to log file

[Tom]

Hi,
I have a log file and of course I want to add the new information to the
end of that log file. Unfortunately I always delete the old information
and only append the current info.

Right now I do it like this:
I call a module which consists of a class and a function. It actually
doesn't matter, but I just included it for the sake of completeness.
The module looks like this:

class log_C:
def errorlog(self, filename, Data, d):
LogFile = file(filename, 'w')
ErrorInfo = Data[d+1]
LogFile.write(ErrorInfo)
LogFile.close()

How can I add the new info without deleting the old info?
I tried the modes 'a' and 'a+' but they both didn't work. Actually the
data was totally unreadable! It was kind of messed up. I don't know why.

Thanks for your help.
Regards, Tom

[Hans Nowak]

Tom wrote:

Hi,
I have a log file and of course I want to add the new information to the
end of that log file. Unfortunately I always delete the old information
and only append the current info.

Right now I do it like this:
I call a module which consists of a class and a function. It actually
doesn't matter, but I just included it for the sake of completeness.
The module looks like this:

class log_C:
def errorlog(self, filename, Data, d):
LogFile = file(filename, 'w')
ErrorInfo = Data[d+1]
LogFile.write(ErrorInfo)
LogFile.close()

How can I add the new info without deleting the old info?
I tried the modes 'a' and 'a+' but they both didn't work. Actually the
data was totally unreadable! It was kind of messed up. I don't know why.

The following works for me:

f = open('c:/temp/test.txt', 'w')
for x in ('fee', 'fi', 'fum', 'fo'): .... print >> f, x
.... f.close()
g = open('c:/temp/test.txt', 'a+r')
print >> g, 'slag-blah'
g.close()
file('c:/temp/test.txt').readlines()

['fee\n', 'fi\n', 'fum\n', 'fo\n', 'slag-blah\n']

HTH,

--
Hans (ha**@zephyrfalcon.org)
http://zephyrfalcon.org/

[Hans Nowak]

I wrote:

>>> g = open('c:/temp/test.txt', 'a+r')

Then again, using 'a' or 'a+' should work too...

--
Hans (ha**@zephyrfalcon.org)
http://zephyrfalcon.org/