This is expected behavior, files are sorted by the importer in alphanumeric order. Please check the wiki documentation.

No this should not be expected behaviour. Even file explorer in Linux can sort these files correctly: 1, 2, 3, ...10, 20,... instead of 1, 10, 2, 20, 3, 30...

Which library are you using in importer? Is there an option to do correct file name sorting?

Thanks,

It is using sort() function of python.

In [5]: l=['1','2','11','12']
In [6]: l.sort()
In [7]: print l
['1', '11', '12', '2']

Why can't you just rename your files to be numbered 01, 02, 03, ..., 10, 11 ?

In [8]: l=['02','01','22','11']
In [9]: l.sort()
In [10]: print l
['01', '02', '11', '22']

The files are dumped using another software and it would too much work to manually change file names every time.

I did a little bit search and turns out there are python ways to do "human sort". I have created a small python file to demonstrate the usage. The core part is simply 3 lines of code:

def human_sort(l):
""" Sort the given list in the way that humans expect.
"""
convert = lambda text: int(text) if text.isdigit() else text
alphanum_key = lambda key: [ convert(c) for c in re.split('([0-9]+)', key) ]
l.sort( key=alphanum_key )

Would you please to include this in your code to replace the default python sorting? It might be just 10 minutes work for you but it would save us lots of trouble. Plus it will make Slicer a lot user friendly.

You may see the sort function in the attached python file.

Many thanks!

I committed your fix in r22835. Thank you for oyur contribution!

Closing resolved issues that have not been updated in more than 3 months