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Print a list to a string?

I would like to get the results of a print operation placed in a
string. For instance, you can very easily create a list and print it
to stdout:

x = [1,2,3]
print x # Will print [1,2,3]

What if I want the text "[1,2,3]" placed in a string? For instance,
something like:

x = [1,2,3]
str = ''
print str x # x = '[1,2,3]'

Any ideas?

Thanks,
--Steve

Oct 31 '07 #1
4 1798
mrstephengross wrote:
I would like to get the results of a print operation placed in a
string. For instance, you can very easily create a list and print it
to stdout:

x = [1,2,3]
print x # Will print [1,2,3]

What if I want the text "[1,2,3]" placed in a string? For instance,
something like:

x = [1,2,3]
str = ''
print str x # x = '[1,2,3]'

Any ideas?

Thanks,
--Steve

Use str(any-object) or repr(any_object) to turn an object into a string
representation of that object. Use str for a human friendlier
representation, and repr for a more explicit representation.

Gary Herron

Oct 31 '07 #2
mrstephengross a écrit :
I would like to get the results of a print operation
print is a statement, it doesn't yield any 'result'.
placed in a
string. For instance, you can very easily create a list and print it
to stdout:

x = [1,2,3]
print x # Will print [1,2,3]

What if I want the text "[1,2,3]" placed in a string? For instance,
something like:

x = [1,2,3]
str = ''
You're shadowing the builtin str type here.
print str x # x = '[1,2,3]'

Any ideas?
any of the following should do:

s = "%s" % x
s = repr(x)
Oct 31 '07 #3
On Wed, 31 Oct 2007 22:17:48 +0000, mrstephengross wrote:
I would like to get the results of a print operation placed in a string.
s = str(x)
If you specifically need to capture the output of print, then something
like this:

>>import cStringIO
s = cStringIO.StringIO()
print >>s, [1, 2, 1.0/5, 'hello world']
s.getvalue()
"[1, 2, 0.20000000000000001, 'hello world']\n"
(And please, please, PLEASE don't ask why 1/5 is 0.2000...01 until you've
read the FAQs on the Python website. Thank you.)

--
Steven
Oct 31 '07 #4
>import cStringIO
>s = cStringIO.StringIO()
print >>s, [1, 2, 1.0/5, 'hello world']
s.getvalue()
Thanks--this works perfectly!

-_Steve

Nov 1 '07 #5

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