Training, Open Source computer languages
PerlPHPPythonMySQLApache / TomcatTclRubyJavaC and C++LinuxCSS 
Search for:
Home Accessibility Courses Diary The Mouth Forum Resources Site Map About Us Contact
 
Python and Tcl - public course schedule [here]
Private courses on your site - see [here]
Please ask about maintenance training for Perl, PHP, Lua, etc
 
what is the difference between range & xrange (py)

Posted by python_myfav (python_myfav), 26 March 2005
i just want to know the difference between range and xrange in python.
i tried out many examples but i find them to be similar  

Posted by admin (Graham Ellis), 26 March 2005
You'll find that they often appear to be identical, BUT ...

The range function generates an internal temporary list which is (usually) then handled item by item, whereas xrange produces an interator through which you can pass without the expense of what could be a large temporary list object.

Example:

for x in range(10000):
will generate a list of ten thousand elements, and will then loop through each of them in turn

for x in xrange(10000):
will genarate ten thousand integers one by one, passing each to the variable x in turn.

So xrange is the one to use if you're looking to generate a huge list of numbers to pass through in something like a for loop, but range is much more flexible as it truely generates an anonymous list.





This page is a thread posted to the opentalk forum at www.opentalk.org.uk and archived here for reference. To jump to the archive index please follow this link.

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2019: Well House Manor • 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01225 708225 • FAX: 01225 793803 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho