> 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]
> 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
>>> g = open('c:/temp/test.txt', 'a+r')
>>> print >> g, 'slag-blah'
['fee\n', 'fi\n', 'fum\n', 'fo\n', 'slag-blah\n']