print(f) for files .. and is print % going away?

[Esmail]

Hello all,

I use the print method with % for formatting my output to
the console since I am quite familiar with printf from my
C days, and I like it quite well.

I am wondering if there is a way to use print to write
formatted output to files?

Also, it seems like I read that formatting with print is
going away eventually and we should start using something
else? Is that true and if so, what?

Thanks,
Esmail

 

[Esmail]

Hi Duncan,

Thanks for the information, I'll dig deeper

(for some reason I can't get the from __future__ import
to work,
File "<stdin>", line 1

SyntaxError: future feature print_function is not defined

but I am probably making some silly mistake, plus
I have been meaning to find out more about this too, so
this is a good chance to learn something new).

Thanks again!

Esmail

 

[Esmail]

You can only use the print function on 2.6 and later. If you have an older
version of Python then you'll get that error.

Ooops, yes, you wrote that and I tried with 2.6 under Windows
(my Ubuntu has 2.5) .. I must have typed something wrong when I
tried this with 2.6 because it's working fine now

Thanks again Duncan,

Esmail

 

[Lie Ryan]

Hello all,

I use the print method with % for formatting my output to
the console since I am quite familiar with printf from my
C days, and I like it quite well.

There has never been print-with-formatting in python, what we have is
the % string substitution operator, which is a string operation instead
of print operation.

I am wondering if there is a way to use print to write
formatted output to files?

Of course:

f = open(...)
open.write('%s' % foo)

or

f = open(...)
print > f, '%s' % foo

or in python 3:
f = open(...)
print('%s' % foo, file=f)

or using the new superpowerful str.format()'foo: 123 bar: 123.5 4.567890e+02'

 

[Esmail]

hello,

There has never been print-with-formatting in python, what we have is
the % string substitution operator, which is a string operation instead
of print operation.

Yes, I see that now, thanks for clarifying it. I guess I thought
so because I've always associated the % formatting with printing.

Of course:

f = open(...)
open.write('%s' % foo)

very nice ..

or using the new superpowerful str.format()
'foo: 123 bar: 123.5 4.567890e+02'

I'll have to check it out - thanks again,

Esmail