On 24/03/2016 13:50, Steven D'Aprano wrote:
On Thu, 24 Mar 2016 02:24 pm, Chris Angelico wrote:
This is how you're currently evaluating Python. Instead of starting
with the most simple and obvious code
One problem is that what counts as "simple and obvious" depends on what you
are used to. Coming from a background of Pascal, iterating over a list like
this:
for i in range(len(mylist)):
print mylist[i]
was both simple and obvious. It took me years to break myself of that habit.
Likewise clearing a list:
for i in range(len(mylist)-1, -1, 0):
del mylist[i]
That's wouldn't be I'd call clearing a list, more like destroying it
completely!
How would you actually clear a list by traversing it (ie. not just
building a new one)?
This doesn't work:
for x in L:
x=0
as each x only refers to the value in each element of L, not the element
itself (like the pass-by-reference problem).
I'd presumably have to do:
for i in range(len(L)):
L[i]=0
--
Bartc
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