On Thursday, October 30, 2014 10:53:13 PM UTC+5:30, Joshua Landau wrote: > On 29 October 2014 03:22, Rustom Mody wrote: > > Yesterday I was trying to introduce python to some senior computer > > scientists. > > > > Tried showing a comprehension-based dir-walker vs a for-loop based one: > > > > def dw(p): > > if isfile(p): > > return [p] > > else: > > return [p] + [c for f in listdir(p) for c in dw(p+'/'+f)] > > > ... > > > > Comment to me : "Well this is neat and compact, but it does not add > > anything fundamental (over usual index based for-loops)" > > > > I tried to say that 'for' over general sequences is quite different > > and significantly more powerful than C/Pascal for over indexes + > > explicit indexing. > > If you really want to show the generality of iteration, I suggest you > start with iterators: > > def walk(path): > yield path > > if isdir(path): > for name in iterdir(path): > for file in walk(path + "/" + name): > yield file
heh! That was my next version -- almost word-for-word [Not on that laptop now; will check later] -- https://mail.python.org/mailman/listinfo/python-list
