how to use sorted key without changing the origonal list-CodePudding

Im trying to find a way to sort the list by the sum of value of every character for each name, and so far the best i got is below. I have no idea how to sort the list while preserving it, but the output ends up being the ord numbers. Ive tried to use a copied list and to get the numbers from that list, but then I have no Idea how to use that to sort the original list.

I want to try to most of the code inside the function, so that it works with the other inputs (sum, length, first name, last name).

Relevant code here:

def namefunction()

        global namelist

        for i in range(0,len(namelist)):

            namelist[i]=list(namelist[i])

            for x in range(0, len(namelist[i])):

                namelist[i][x]=ord(namelist[i][x])

        return sum

print(*sorted(namelist, key= namefunction()), sep='\n')

Full code for reference here (not really necessary to look at)

print('You can sort by first name, last name, length, sum, or words .')

keycheck=input("What do you want to sort by? ")

namelist=['John S. Zmile', 'Giorno Giovana',
          'Kakyoin Hanagashi', 'Trilaw Flanger', 'Stephane Locost', 
          'Bobert Hobert', 'Volvo B10BLE', 'Dale Reid', 'Annika Sörenstam', 
          'Cryt Fider', 'Valentine Prinsep', 'Gamrekeli Tony Toreli']

def namefunction():

    if keycheck=="firstname": 

        return   

    elif keycheck=="last name":

        return lambda x:x[x.rfind(' ') 1]

    elif keycheck=="length":

        return len

    elif keycheck=="words":              
 
        return lambda x: -len(x.split()) 

    elif keycheck =="sum":

        global namelist

        for i in range(0,len(namelist)):

            namelist[i]=list(namelist[i])

            for x in range(0, len(namelist[i])):

                namelist[i][x]=ord(namelist[i][x])

        return sum

print(*sorted(namelist, key= namefunction()), sep='\n')

CodePudding user response：

If I well understand, you want to sort a list of strings by the sum of their characters.

def value(char):
    """ Return the position of the character in the alphabet. You could replace it by ord."""
    if not char.isalpha():
        return 0
    return ord(char.lower()) - 96


def namefunction():
    
    if keycheck == "firstname":
        return lambda x: x.split()[0]

    elif keycheck == "last name":
        return lambda x: x.split(" ")[-1]

    elif keycheck == "length":
        return len

    elif keycheck == "words":
        return lambda x: len(x.split())

    elif keycheck == "sum":
        return lambda x: sum(map(value, x))


key = namefunction()
print(*sorted(namelist, key=key), sep='\n')