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python sort list by custom function Code Example
python sort list by custom function 
from functools import cmp_to_key
sorted(mylist, key=cmp_to_key(lambda item1, item2: fitness(item1) - fitness(item2)))
Source: stackoverflow.com
python sort list by custom function 
from functools import cmp_to_key
sorted(mylist, key=cmp_to_key(compare))
Source: stackoverflow.com
python sort a list by a custom order 
# Example usage:
list_to_sort = [('U', 23), ('R', 42), ('L', 17, 'D')]
custom_sort_order = ['R', 'D', 'L', 'U']
sorted(list_to_sort, key=lambda list_to_sort: custom_sort_order.index(list_to_sort[0]))
# Where 0 is the tuple index to use for sorting by custom order
--> [('R', 42), ('L', 17, 'D'), ('U', 23)]
Source: stackoverflow.com



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