Loop three lists at the same time?

[Davy]

Hi all,

I have three lists with the same length. Is there any method to loop
the three lists without a loop counter?

Best regards,
Davy

 

[J. Robertson]

Hi all,

I have three lists with the same length. Is there any method to loop
the three lists without a loop counter?

Best regards,
Davy

Hello,

the zip function?

list1 = [1,2,3]
list2 = [4,5,6]
list3 = [7,8,9]
for a,b,c in zip(list1,list2,list3):

.... print a, b, c
....
1 4 7
2 5 8
3 6 9

hth
j.

 

[cokofreedom]

Hi all,

I have three lists with the same length. Is there any method to loop
the three lists without a loop counter?

Best regards,
Davy

What exactly do you mean?

Are you trying to loop them together with the same ´count´. "for loop
in zip(1,2,3) kind of thing or something else.

Please either post a more descriptive question, or your current code.

Coko

 

[Gabriel Genellina]

I have three lists with the same length. Is there any method to loop
the three lists without a loop counter?

Try zip or itertools.izip:

py> L1 = ['a','b','c']
py> L2 = [1, 2, 3]
py> L3 = ['I', 'II', 'III']
py> from itertools import izip
py> for x,y,z in izip(L1,L2,L3):
.... print x,y,z
....
a 1 I
b 2 II
c 3 III

 

[Guest]

Hi all,

I have three lists with the same length. Is there any method to loop
the three lists without a loop counter?

Best regards,
Davy

Maybe you just need this

list1 = [1, 2, 3]
list2 = [4, 5, 6]
list3 = [7, 8, 9]
for i in list1+list2+list3:

.... print i
....

 

[Michael J. Fromberger]

Hi all,

I have three lists with the same length. Is there any method to loop
the three lists without a loop counter?

Best regards,
Davy

Davy,

Look at the "zip" function,

<http://docs.python.org/lib/built-in-funcs.html>

Look near the bottom of the page.

Example:
zip([1,2,3], [4,5,6], [7,8,9])
==> [(1, 4, 7), (2, 5, 8), (3, 6, 9)]

Cheers,
-M