Folks,
I am developing a program which I'd like to be python 2 and 3
compatible. I am still relatively new to python and I use primarily py3
for development. Every once in a while I use a py2 interpreter to see if
my tests pass through.
I just spent several hours tracking down a bug which was related to the
fact that zip is an iterator in py3 but not in py2. Of course I did not
know about that difference. I've found the izip() function which should
do what I want, but that awful bug made me wonder: is it a bad practice
to interactively modify the list you are iterating over?
I am computing mass fluxes along glacier branches ordered by
hydrological order, i.e. branch i is guaranteed to flow in a branch
later in that list. Branches are objects which have a pointer to the
object they are flowing into.
In pseudo code:
for stuff, branch in zip(stuffs, branches):
# compute flux
...
# add to the downstream branch
id_branch = branches.index(branch.flows_to)
branches[id_branch].property.append(stuff_i_computed)
So, all downstream branches in python2 where missing information from
their tributaries. It is quite a dangerous code but I can't find a more
elegant solution.
Thanks!
Fabien
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