I have a list of objects of the same type
lis = [<obj>, <obj>, <obj>]
that I wish to sort naturally by the object attribute name
. I have tried
sortedlist = sorted(lis, key=lambda x: x.name)
However this sorts the list as
A1
A10
A2
Not in the format that I wanted
A1
A2
A10
I have tried modifying the code from sorting alphanumeric strings , but I can't get it working for a list of objects.
This way uses groupby, and works for an arbitrary number of swaps between alpha and digits
from itertools import groupby
def keyfunc(s):
return [int(''.join(g)) if k else ''.join(g) for k, g in groupby(s, str.isdigit)]
sorted(my_list, key=keyfunc)
Demo:
>>> my_list =['A1', 'A10', 'A2', 'B0', 'AA11', 'AB10']
>>> sorted(my_list, key=keyfunc)
['A1', 'A2', 'A10', 'AA11', 'AB10', 'B0']
>>> mylist =['foo1', 'foo10', 'foo2', 'foo2bar1', 'foo2bar10', 'foo2bar3']
>>> sorted(mylist, key=keyfunc)
['foo1', 'foo2', 'foo2bar1', 'foo2bar3', 'foo2bar10', 'foo10']
sorted(obj, key=lambda x: (x.name[0], int(x.name[1:])))
Something like this:
import re
def func(x):
foo = re.search(r'([A-Z]+)(\d+)',x.name)
return foo.group(1), int(foo.group(2))
print sorted(obj, key = func)
Demo:
lis =['A1', 'A10', 'A2', 'B0', 'AA11', 'AB10']
def func(x):
foo = re.search(r'([A-Z]+)(\d+)',x)
return foo.group(1), int(foo.group(2))
print sorted(lis, key = func)
#['A1', 'A2', 'A10', 'AA11', 'AB10', 'B0']
A slightly modified version of sorted_nicely
that can work for your object:
def sorted_nicely( x ):
""" Sort the given iterable in the way that humans expect."""
convert = lambda text: int(text) if text.isdigit() else text
return [ convert(c) for c in re.split('([0-9]+)', x.name) ]
obj.sort(key = sorted_nicely)
#or sorted(obj, key = sorted_nicely)
This answers the OP question how to sort the list of objects "naturally" by a property:
import re
def natkey(s):
return [w or int(n) for w, n in re.findall('(\D+)|(\d+)', s)]
class X:
def __init__(self, name):
self.name = name
lst = [X('AB1'), X('AB10'), X('AB2'), X('AB12')]
lst.sort(key=lambda obj: natkey(obj.name))
print [obj.name for obj in lst]
# ['AB1', 'AB2', 'AB10', 'AB12']
I was able to find a solutions based on beauburriers solution to natural sorting
Modified to remove the custom key option
import re
def natural_sort(lis):
"""
Sort the list into natural alphanumeric order.
"""
def get_alphanum_key_func(key):
convert = lambda text: int(text) if text.isdigit() else text
return lambda s: [convert(c) for c in re.split('([0-9]+)', key(s))]
sort_key = get_alphanum_key_func(lambda x: x.name)
lis.sort(key=sort_key)
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