Suggestion for the PythonDevelopme nt for next version

[azrael]

You know, sometimes it annoys me to write a for loop in Python. If we
use a list a=[1,2,3,4], and want to loop through it, Python offers the
next option

>>>for i in a:
print i

1
2
3
4

I love this. So simple and smooth. But what happens if we need also
the position of an object in a list. Then there comes this annoying
writing.

>>for i in range(len(a)):
print a[i], i

1 0
2 1
3 2
4 3

I think that it would be great if the Python language, which is a
totaly OOP language, could also use the index variable from the first
example and consider it as an object with a Object variable. I mean
the following.

>>>for i in a:
print i, i.index # i.index is my sugesstion

1 0
2 1
3 2
4 3

I think that this would be great and we cou pass by this annoying
"range(len( a))" functions

[Diez B. Roggisch]

azrael wrote:

You know, sometimes it annoys me to write a for loop in Python. If we
use a list a=[1,2,3,4], and want to loop through it, Python offers the
next option

>>>>for i in a:
print i

1
2
3
4

I love this. So simple and smooth. But what happens if we need also
the position of an object in a list. Then there comes this annoying
writing.

>>>for i in range(len(a)):
print a[i], i

1 0
2 1
3 2
4 3

I think that it would be great if the Python language, which is a
totaly OOP language, could also use the index variable from the first
example and consider it as an object with a Object variable. I mean
the following.

>>>>for i in a:
print i, i.index # i.index is my sugesstion

1 0
2 1
3 2
4 3

I think that this would be great and we cou pass by this annoying
"range(len( a))" functions

Luckily for those who read either the documentation or this form regulary,
the solution is already there (since python2.0 or so...)

for i, item in enumerate(itera ble):
...

does the trick.

Diez

[Bruno Desthuilliers]

azrael a écrit :

You know, sometimes it annoys me to write a for loop in Python. If we
use a list a=[1,2,3,4], and want to loop through it, Python offers the
next option

>>>for i in a:
print i

1
2
3
4

I love this. So simple and smooth. But what happens if we need also
the position of an object in a list. Then there comes this annoying
writing.

>>>for i in range(len(a)):
print a[i], i

1 0
2 1
3 2
4 3

for index, obj in enumerate(any_s equence):
print "obj %s is at position %s" % (obj, index)

print "And I might read the FineManual(tm) some day..."

HTH !-)
Oh, and while we're at it:

I think that it would be great if the Python language, which is a
totaly OOP language, could also use the index variable from the first
example and consider it as an object with a Object variable. I mean
the following.

>>>>>for i in a:
print i, i.index # i.index is my sugesstion

Python is 100% OO in that everything (at least everything you can bind
to a name) is an object. But it doesn't mean everything has to be done
using the dotted syntax...