erikcw wrote:
> To make it write over the data, I ended up adding, which seems to work
> fine.
>
> f = open('_i_defines.php', 'w+')
that doesn't work; you need to use "r+" if you want to keep the original
contents.
"w+" means truncate first, update then:
>>> f = open("foo.txt", "r")
>>> f.read()
'hello\n'
>>> f.close()
>>> f = open("foo.txt", "r+")
>>> f.read()
'hello\n'
>>> f.close()
>>> f = open("foo.txt", "w+")
>>> f.read()
''
the standard approach when updating text files is to create a *new*
file, though:
fi = open(infile)
fo = open(infile + ".tmp", "w")
filter fi to fo
fo.close()
fi.close()
if os.path.exists(infile + ".bak")
os.remove(infile + ".bak")
os.rename(infile, infile + ".bak")
os.rename(infile + ".tmp", infile)
this leaves the old file around with a .bak extension, which is nice
if something goes wrong during filtering.
</F>
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