472,364 Members | 2,087 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 472,364 software developers and data experts.

string formatting quirk?


''%([]) doesn't raise exception
''%('') does

Can anyone explain me why??


Jul 19 '05 #1
1 1161
an**********@yahoo.com wrote:
''%([]) doesn't raise exception
''%('') does

Can anyone explain me why??

That is a side-effect of duck-typing. The duck-type of an empty list is
indistinguishable from that of an empty dictionary. Not testing the exact
type here achieves consistency with the behaviour of custom dictionaries,
e. g:
class List(list): .... def __getitem__(self, index):
.... return list.__getitem__(self, int(index))
.... "%(0)s" % List([42]) '42' "%(1)s %(0)s" % List([42, 24]) '24 42' "" % List([])



Jul 19 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: Thomas Philips | last post by:
Consider the following simple dictionary e={1:'one', 2: 'two'} e >>>'one' However, If I attempt to print e using a formatted string print " %(1)s" %e, I get a KeyError: '1'
by: Oliver S. | last post by:
I've developed a string-class that holds the string in an array which is a member-variable of the class and that has maximum-size which is con- figurable through a template-parameter. If any...
by: hagai26 | last post by:
I am looking for the best and efficient way to replace the first word in a str, like this: "aa to become" -> "/aa/ to become" I know I can use spilt and than join them but I can also use regular...
by: Andrew Connell | last post by:
Having fits transforming an XML string using an XSL file. In the 1.1 version of the framework, I see that the XmlResolver is heavily used in the XslTransform class. However, that looks like I am...
by: Dennis Myrén | last post by:
Hi. Is there a way to utilize the great primitive data type formatting routines available in .NET without working with strings? I want a byte directly rather than a string. I think it is...
by: ilona | last post by:
Hi all, I store phone numbers in the database as 123447775665554(input mask is used for input, and some numbers have extensions), and I also know from db if the number is Canadian, US, or some...
by: Dominique Vandensteen | last post by:
after the very small & vs string.format discussion I did some speed tests... loop of 1.000.000 concatenations of 5 public string variables in a class gave following results: result = a & b...
by: L. Scott M. | last post by:
Have a quick simple question: dim x as string x = "1234567890" ------------------------------------------------------- VB 6 dim y as string
by: Scott M. | last post by:
Ok, this is driving me nuts... I am using VS.NET 2003 and trying to take an item out of a row in a loosely-typed dataset and place it in a label as a currency. As it is now, I am getting my...
by: schoedl | last post by:
Hello, we often compose strings via a ostringstream and then create a string from it. What is the rationale of not being able to use string in place of a ostringstream, so I could write ...
by: Naresh1 | last post by:
What is WebLogic Admin Training? WebLogic Admin Training is a specialized program designed to equip individuals with the skills and knowledge required to effectively administer and manage Oracle...
by: antdb | last post by:
Ⅰ. Advantage of AntDB: hyper-convergence + streaming processing engine In the overall architecture, a new "hyper-convergence" concept was proposed, which integrated multiple engines and...
by: AndyPSV | last post by:
HOW CAN I CREATE AN AI with an .executable file that would suck all files in the folder and on my computerHOW CAN I CREATE AN AI with an .executable file that would suck all files in the folder and...
by: Arjunsri | last post by:
I have a Redshift database that I need to use as an import data source. I have configured the DSN connection using the server, port, database, and credentials and received a successful connection...
by: WisdomUfot | last post by:
It's an interesting question you've got about how Gmail hides the HTTP referrer when a link in an email is clicked. While I don't have the specific technical details, Gmail likely implements measures...
by: Matthew3360 | last post by:
Hi, I have been trying to connect to a local host using php curl. But I am finding it hard to do this. I am doing the curl get request from my web server and have made sure to enable curl. I get a...
by: Oralloy | last post by:
Hello Folks, I am trying to hook up a CPU which I designed using SystemC to I/O pins on an FPGA. My problem (spelled failure) is with the synthesis of my design into a bitstream, not the C++...
by: Carina712 | last post by:
Setting background colors for Excel documents can help to improve the visual appeal of the document and make it easier to read and understand. Background colors can be used to highlight important...
by: ezappsrUS | last post by:
Hi, I wonder if someone knows where I am going wrong below. I have a continuous form and two labels where only one would be visible depending on the checkbox being checked or not. Below is the...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.