Inspiration and influence of the else clause of loop statements?

Posted by Aristide on Stack Overflow See other posts from Stack Overflow or by Aristide
Published on 2010-05-27T20:06:03Z Indexed on 2010/05/28 14:11 UTC
Read the original article Hit count: 203

Filed under:

python

|

loop

|

history

|

else

Python offers an optional loop-else clause which is executed if and only if the loop is not terminated by a break. (In other words, the condition fails for a while-loop or the iterator is exhausted for a for-loop.)

Does this loop-else construct originate from another language? (Either theoretical or actually implemented.) Has it been taken up in any newer language?

Maybe I should ask the former of Guido, but surely he is too busy for such a futile inquiry. ;-)

Related discussion and examples: Pythonic ways to use ‘else’ in a for loop

© Stack Overflow or respective owner

Related posts about python

unmet dependencies in Ubuntu 12.04

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I tried today to install a dvb-card on my Ubuntu 12.04 (Linux blauhai-linux 3.2.0-25-generic #40-Ubuntu SMP Wed May 23 20:30:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux ). The installation failed with an error. After that, i tried to install python (it was already installed but i got this error): linux:~$… >>> More
How can I get sikuli-ide to work?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I installed sikuli-ide with sudo apt-get install sikuli-ide Everything was fine until I tried to start it from the terminal. I typed sikuli-ide But the only response I got was [info] locale: en_US The application was not started, furthermore there is no desktop file and sikuli-ide does not… >>> More
Getting PATH right for python after MacPorts install

as seen on Super User - Search for 'Super User'
I can't import some python libraries (PIL, psycopg2) that I just installed with MacPorts. I looked through these forums, and tried to adjust my PATH variable in $HOME/.bash_profile in order to fix this but it did not work. I added the location of PIL and psycopg2 to PATH. I know that Terminal is… >>> More
call python with system() in R to run a python script emulating the python console

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to pass a chunk of Python code to Python in R with something like system('python ...'), and I'm wondering if there is an easy way to emulate the python console in this case. For example, suppose the code is "print 'hello world'", how can I get the output like this in R? >>> print… >>> More
Python - Calling a non python program from python?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am currently struggling to call a non python program from a python script. I have a ~1000 files that when passed through this C++ program will generate ~1000 outputs. Each output file must have a distinct name. The command I wish to run is of the form: program_name -input -output -o1 -o2… >>> More

Related posts about loop

Label in PyQt4 GUI not updating with every loop of FOR loop

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm having a problem, where I wish to run several command line functions from a python program using a GUI. I don't know if my problem is specific to PyQt4 or if it has to do with my bad use of python code. What I wish to do is have a label on my GUI change its text value to inform the user which… >>> More
breaking out of for loop when running a function inside a for loop

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm embarrassed that I'm asking this question, but here I go: Suppose you have the following function foo. When I'm running a for loop, I'd like it to skip the remainder of foo when foo initially returns the value of 0. However, break doesn't work when it's inside a function. As it's currently… >>> More
breaking out of for loop when running a function inside a for loop in R

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm embarrassed that I'm asking this question, but here I go: Suppose you have the following function foo. When I'm running a for loop, I'd like it to skip the remainder of foo when foo initially returns the value of 0. However, break doesn't work when it's inside a function. As it's currently… >>> More
Help with converting foreach loop to while loop in c#

as seen on Stack Overflow - Search for 'Stack Overflow'
I had learnt by reading your great answers here, that it is not good practice deleting items from within a foreach loop, as it is (and I quote) "Sawing off the branch you're sitting on". My code currently removes the text from the dropdownlist, but the actual item remains (just without text displayed)… >>> More
How John Got 15x Improvement Without Really Trying

as seen on Oracle Blogs - Search for 'Oracle Blogs'
The following article was published on a Sun Microsystems website a number of years ago by John Feo. It is still useful and worth preserving. So I'm republishing it here. How I Got 15x Improvement Without Really Trying John Feo, Sun Microsystems Taking ten "personal" program… >>> More