[Tutor] string formatting
Pirritano, Matthew
MPirritano at ochca.com
Mon Sep 19 17:46:27 CEST 2011
Pythonistas,
This is the resolution of a question I asked over the weekend.
The method I was thinking of was in a program I wrote on my work
computer but couldn't remember.
Now I'm at work and I see. It is not including the tuple at the end of
the string nor using a dictionary. There is another way using locals().
I was trying to remember this method:
You some variables say:
X = "sky"
Y = "blue"
Print "the %(x)s is %(y)s" % locals()
the sky is blue
That works! And in cases where I'm replacing over 20 strings it's much
easier than having to include a tuple at the end. Especially when
there's only two or three variables I'm replacing repeatedly, in which
case a dictionary seems like overkill.
Thanks
Matt
Matthew Pirritano, Ph.D.
Research Analyst IV
Medical Services Initiative (MSI)
Orange County Health Care Agency
(714) 568-5648
-----Original Message-----
From: tutor-bounces+mpirritano=ochca.com at python.org
[mailto:tutor-bounces+mpirritano=ochca.com at python.org] On Behalf Of
Steven D'Aprano
Sent: Saturday, September 17, 2011 6:58 PM
To: tutor at python.org
Subject: Re: [Tutor] string formatting
Matthew Pirritano wrote:
> But I have very large blocks of text and I thought there was another
way
> like
>
> X = "sky"
> Y = "blue"
> "the %(X)s is %(Y)s"
Unless you use the string formatting operator %, strings containing "%"
are just strings. Large or small, the way you do string formatting is
with the % operator. Python will never do string formatting without an
explicit command to do so:
text % value # Single non-tuple argument
text % (value, value, ...) # Multiple arguments
They don't have to be string literals, they can be variables:
text = "Hello, I'd like to have an %s"
value = "argument"
print text % value
You can also use named arguments by using a dictionary:
text = "Hello, I'd like to have an %(X)s"
values = {"X": "argument"}
print text % values
More details in the Fine Manual:
http://docs.python.org/library/stdtypes.html#string-formatting
Alternatives include the new advanced formatting method:
text.format()
http://docs.python.org/library/string.html#formatstrings
and "$" substitutions with the string module:
import string
string.Template
http://docs.python.org/library/string.html#template-strings
--
Steven
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