"Write to a file" question please?

[Alex Martelli]

[posted and mailed]

<cmfinlay at SPAMmagnet.com.au> wrote in message
news:tzFjOfN2zOzPHwvl3ncklEAEb+fa at 4ax.com...
> number = 100
> print "Number =", number
> OUT = open("TT.txt","w")
> OUT.write("Number =", number) # Error
> OUT.close()

The write method accepts one string argument.

You can make a string argument as you seem to
desire with the %-operator:

OUT.write("Number = %d\n" % (number,))

I added the \n line terminator to the string,
because it's not implicit (in print, it IS
implicit, but not in .write).


Another alternative:

    import sys
    sys.stdout = OUT
    print "Number =", number
    sys.stdout = sys.__stdout__
    OUT.close()

By assigning an opened file to sys.stdout
you temporarily "redirect" the output of
normal "print" to that file; you can then
go back to normal using sys.__stdout__,
which keeps the ORIGINAL value.  Not worth
it for writing just a few things, but fine
if you have some function doing a lot of
output with print, for example.


Alex