Hi !
A.)
The string object have a method named "index", and have a method named
"find".
It is good, because many times we need to find anything, and it is
very long to write this:
try:
i=s.index('a')
except:
i=-1
if i<>-1: pass
and not this:
if (s.find('a')<>-1): pass
Why don't exists same method in the list object ?
It is very ugly thing (sorry, but I must say that).
I must write in every times:
l=[1,2,3,4]
try:
i=l.index(5)
except:
i=-1
if i<>-1: pass
and not this:
if (l.find(5)<>-1): pass
B.)
Same thing is the deleting.
I think, this method is missing from strings, and lists.
Example:
I must write this:
s='abcdef'
l=[1,2,5,3,4,5]
print s
s=s[:2]+s[3:]
print s
print l
l[2]=None
l.remove(None)
print l
and not this:
s='abcdef'
l=[1,2,5,3,4,5]
s=s.delete(2)
l.delete(2)
So: some functions/methods are neeeded to Python-like programming
(less write, more effectivity).
KK 2 1168
On Thu, 27 Nov 2003 10:48:04 +0100, Kepes Krisztian wrote: The string object have a method named "index", and have a method named "find". It is good, because many times we need to find anything, and it is very long to write this:
try: i=s.index('a') except: i=-1 if i<>-1: pass
and not this:
if (s.find('a')<>-1): pass
Why don't exists same method in the list object ?
It is very ugly thing (sorry, but I must say that).
I must write in every times:
l=[1,2,3,4] try: i=l.index(5) except: i=-1 if i<>-1: pass
and not this: if (l.find(5)<>-1): pass
You can simply use the 'in' operator:
a = "test"
b = ['t', 'e', 's', 't']
if 's' in a: ...
if 's' in b: ...
'find' and 'index' will give you the position of the first
occurrence of what you are looking for; but 'find' will return
-1 if what you are looking for is not in the string whereas 'index'
will return a ValueError (s. example below). If you just want to
test, whether something is in a string or a list, use 'in'.
's' in a --> True
's' in b --> True
a.find('s') --> 2
b.index('s') --> 2
'z' in a --> False
'z' in b --> False
a.find('z') --> -1
a.index('z') --> ValueError
HTH, L.
--
mailto: logan@phreaker(NoSpam).net
Kepes Krisztian wrote: The string object have a method named "index", and have a method named "find". Why don't exists same method in the list object ?
It does:
Python 2.3.2 (#49, Oct 2 2003, 20:02:00) [MSC v.1200 32 bit (Intel)] on win32 l = [1, 2, 3] l = list('abcdefg') l
['a', 'b', 'c', 'd', 'e', 'f', 'g'] l.index('d')
3
..find() doesn't exist on lists, perhaps because nobody has asked for it
and presented a good use case. It seems to me quite rare that somebody
needs to search for a sublist in a list, and you can already search for
individual elements with "in".
Same thing is the deleting. I think, this method is missing from strings, and lists.
Strings are immutable, and you can already delete elements
from lists. Or did I miss something... your request was
a little confusing.
-Peter This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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