On Thursday 27 November 2003 11:16 am, Kepes Krisztian wrote:
...
> try:
> i=s.index('a')
> except:
> i=-1
> if i<>-1: pass
>
> and not this:
>
> if (s.find('a')<>-1): pass
Why don't you use the clearer, faster, more readable, AND more concise idiom
if 'a' in s: pass
instead?
> Why don't exists same method in the list object ?
The 'in' operator works just fine for lists, too.
Perhaps if you studied Python's present capabilities a bit better, before
requesting changes and additions to Python, you might achieve better
results faster.
> Same thing is the deleting.
>
> I think, this method is missing from strings, and lists.
Look at the 'del' keyword (and slice assignments) -- for lists only:
> print l
> l[2]=None
> l.remove(None)
del l[2]
or equivalently
l[2:3] = []
> and delete more:
> s.delete() # s=''
Python strings are immutable and will always remain immutable. There is
NO way to change an existing string object and there will never be.
> l.delete() # l=[]
l[:] = []
or equivalently
del l[:]
> s.delete(2,2) # s='abef'
Ditto.
> l.delete(2,2) # l=[1,2,4,5]
l[2:4] = []
or equivalently
del l[2:4]
> So: some functions/methods are neeeded to Python-like programming
> (less write, more effectivity).
This is quite possible, but I have seen almost none listed in your wishlist.
I.e., the only task you've listed that is not performed with easy, popular and
widespread Python idioms would seem to be a string method roughly equivalent
to the function:
def delete(s, from, upto=None):
if upto is None: upto = from + 1
return s[:from] + s[upto:]
returning "a copy of s except for this slice". However, the addition of more
functions and methods that might (perhaps) save typing a few characters,
allowing a hypothetical
z = s.delete(a, b)
in lieu of
z = s[:a] + s[b:]
must overcome a serious general objection: as your very request shows,
people ALREADY fail to notice and learn a lot of what Python offers today.
Adding more and more marginally-useful functions and methods might therefore
more likely just cause people to fail to notice and learn a larger fraction
of Python's capabilities, rather than supply any burningly needed usefulness.
Alex
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