iterator expression - please explain

[Helmut Jarausch]

Hi,

with Python 2.4a0 (CVS 2004/05/24)
I get

def myfun(myarg):
for z in myarg:
print z

myfun(x^2 for x in xrange(10))
2
3
0
1
6
7
4
5
10
11

I expected the sequence 0,1,4,9,....
What am I missing and what's going on here?

Many thanks for a hint,
Helmut.

---
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

 

[Erik Max Francis]

myfun(x^2 for x in xrange(10)) ...
I expected the sequence 0,1,4,9,....
What am I missing and what's going on here?

^ is the bitwise xor operator. You wanted **. (Although what you wrote
above isn't legal anyway.)

 

[Helmut Jarausch]

Helmut Jarausch wrote:




^ is the bitwise xor operator. You wanted **. (Although what you wrote
above isn't legal anyway.)

Many thanks for pointing out that silly mistake.
But why isn't it legal?
By the way, the corrected version (with **) works just fine (with the
CVS version of Python from the weekend or today)

Helmut.

--
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

 

[Erik Max Francis]

Many thanks for pointing out that silly mistake.
But why isn't it legal?

It's not legal because you typed it in, rather than cutting and pasting
it. You meant:

myfun([x**2 for x in xrange(10)])

 

[Yermat]

Helmut Jarausch wrote:

Many thanks for pointing out that silly mistake.
But why isn't it legal?

It's not legal because you typed it in, rather than cutting and pasting
it. You meant:

myfun([x**2 for x in xrange(10)])

I don't think so ! It seems to be the new feature "generator expression"
or something like that...

See http://www.python.org/peps/pep-0289.html

 

[Erik Max Francis]

I don't think so ! It seems to be the new feature "generator
expression"
or something like that...

Oh, sorry about that, you said you were using the latest version from
CVS but it didn't register.