MRAB wrote:
You should've read the thread entitled "Why don't generators execute until first yield?"! :-) Michael Torrie gave the URL http://www.dabeaz.com/generators/Generators.pdf. Your example can be rewritten as follows:p = file('/etc/passwd') # No need for readlines() because file's iterator yields the lines. r = ( e.strip().split(':') for e in p ) # A generator expression instead of a list comprehension. s = [ e[0:1] + e[2:] for e in r ]
Thanks, this is very elegant indeed, but because there are two list comprehension expressions (the one defining r and the one defining s), it means that the we're looping twice over the same list instead of once with the e[0,2:] hypotetical notation ; or am I missing something ?
Yves. http://www.SollerS.ca -- http://mail.python.org/mailman/listinfo/python-list
