list comprehension else nothing python-CodePudding

I trying to use list comprehension to add names that not in list, and i don't know how to use something like else pass

list_test = []
names = ['Gabriel', 'Lucas', 'Pedro', 'Gabriel', 'Fernando'] # To see the 'Ellipsis' just increase this list

# I know that if i use loop 'for ...' this problem could be solved
# but the original code work like this and i can't change it (this part is only a small slice)

count = 0
while True:
    if count == len(names): # breaks when all names are read
        break

    name = names[count] # Just select each name

    list_test.append(name if name not in list_test else) # i don't know what put in else to pass

    count  = 1

print(list_test)

I Tried else ... but in original code add 'Ellipsis' to list, in this code sometimes works, but i need a better solution

I want the output is like: ['Gabriel', 'Lucas', 'Pedro', 'Fernando']

Someone can help me? ;-

CodePudding user response：

If you want to keep unique values in order you can transform to dictionary keys and back to list:

names = ['Gabriel', 'Lucas', 'Pedro', 'Gabriel', 'Fernando']
list_test = list(dict.fromkeys(names).keys())

output:

['Gabriel', 'Lucas', 'Pedro', 'Fernando']

If order does not matter, use a set:

list_test = list(set(names))

(potential) output:

['Lucas', 'Gabriel', 'Pedro', 'Fernando']