List remove duplicates

Question

In the for cycle there is a function to remove all duplicates, but it doesn't. Also the .upper sometimes doesn't work. Please help.

from collections import OrderedDict
def ask():
  global x
  x = str(input("Enter your logical operation:"))
  x = x.split( )
  x = [x.upper() for x in x]
  return x

ask()

for i in range(0,len(x)):
  and_index = x.index("AND",i)
  n = list(OrderedDict.fromkeys(str(and_index)))
  print(n)

print(n)

Does this answer your question? [How do you remove duplicates from a list whilst preserving order?](https://stackoverflow.com/questions/480214/how-do-you-remove-duplicates-from-a-list-whilst-preserving-order) — Salim Mahboubi, Nov 27 '19 at 09:46
mylist = ["a", "b", "c", "a", "b"] newlist = list(set(mylist)) print(newlist) — user341143, Nov 27 '19 at 09:52

user341143 · Answer 1 · 2019-11-27T09:56:51.880

1

Example to remove duplicate from list

mylist = ["a", "b", "c", "a", "b"]
newlist = list(set(mylist))
print(newlist)

output : ["a", "b", "c"]

edited Nov 27 '19 at 09:56

answered Nov 27 '19 at 09:50

user341143

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4
12

score 1 · Accepted Answer · answered Nov 27 '19 at 09:50

First of all you're not even saving output of your ask() function, but instead serving it globally, that's not a good practice.

def ask():
  x = input("Enter your logical operation:")
  return list(map(str.upper, x.split()))

user_input = ask()

Then to simply remove duplicates you could convert your list to set, doing so will loose order of our list but will quickly and easly remove duplicates

user_input = list(set(user_input))

In case you want to keep order of operations entered by user you could use OrderedDict

from collections import OrderedDict
user_input = list(OrderedDict.fromkeys(user_input))

List remove duplicates

2 Answers2