RE: Python: Please Help Understanding String Formatting Syntax
- From: "Ken Perry" <whistler@xxxxxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Tue, 2 Aug 2011 16:20:09 -0400
If you search for "two or more" on this page it will take you right to what
your wanting.
http://docs.python.org/library/stdtypes.html
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Homme, James
Sent: Tuesday, August 02, 2011 1:22 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Python: Please Help Understanding String Formatting Syntax
Hi,
I understand what I have read about string formatting so far in the Python
Standard Library documentation, namely, I understand about using the % sign
and various letters, then using either a single string or a tuple to specify
what to substitute, but I don't understand some things about the below
string formatting. This piece of text is from the book The Python Standard
Library By Example, and talks about the ConfigParser module. Specifically, I
don't understand why it excepts the formatting without quotes, and I'm
guessing that the s after the parentheses means that the various pieces are
strings. I can see that it's grabbing values from the key-value pares. In
my reading, though, about string formatting, I haven't seen this particular
syntax. Where is it in the Python docs?
See below.
14.8.7. Combining Values with Interpolation
SafeConfigParser provides a feature called interpolation
that can be used to combine values together. Values containing standard
Python format strings trigger the interpolation feature when they are
retrieved
with get().
Options named within the value being fetched are replaced with their values
in turn, until no more substitution is necessary.
... For example, this configuration file separates the protocol, hostname,
and port from the URL as separate options.
[bug_tracker]
protocol = http
server = localhost
port = 8080
url = %(protocol)s://%(server)s:%(port)s/bugs/
Thanks.
Jim
Jim Homme,
Usability Services,
Phone: 412-544-1810.
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