Using for... for multiple lists

[Harlin Seritt]

I am using the following code:

for i, f in filelist, self.checkbox:
if f.get():
print i

I am getting an error:

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python23\lib\lib-tk\Tkinter.py", line 1345, in __call__
return self.func(*args)
File "install.py", line 123, in select_stage
for i, f in filelist, self.checkbox:
ValueError: unpack list of wrong size

Both filelist and self.checkbox are the same size (4 items btw). Is
there any way to get this done?

Thanks,

Harlin

 

[Diez B. Roggisch]

Both filelist and self.checkbox are the same size (4 items btw). Is

there any way to get this done?

Use zip:

a, b = [1,2,3], ['a', 'b', 'c']
for i,j in zip(a,b):
print i,j

Or from itertools izip - which should be slightly more performant and less
memory consuming.

 

[Heiko Wundram]

for i, f in filelist, self.checkbox:
if f.get():
print i

Use:

for i, f in zip(filelist,self.checkbox):
<bla>

--
--- Heiko.

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[gene.tani]

If sequences are not same length:

zip truncates to length of shortest input sequence

map(None, seq1, seq2) pads to length of longest seq.

(can't remember what itertools.izip() does)

 

[Harlin Seritt]

Actually the sequences are of the same length. Forgot to mention that.

thanks,

Harlin