在 python 中编写一个程序，其中不包含输入字符串中的任何重复字符。 示例：A 重复了一个

Question

input is: This is An Example

Output: This An Exmpl

li = input("Enter your Sting")
res = ''
for ch in li:
    if ch not in res :
        res = res + ch
        print(res, end=' ')

Answer 1

li = input("Enter your string")
res = ''
for ch in li.lower():
    if ch not in res:
        res = res + ch
print(res.title(), end='')

Answer 2

I am sure there will be a more elegant way to do this but for now here is a working version which you could refactor or reduce if needed

user_input = input("sentance: ")
seen = set()
filtered_words = []
for word in user_input.split():
    filtered_word = ""
    for char in word:
        if char.lower() in seen:
            continue
        filtered_word += char
        seen.add(char.lower())
    if filtered_word != "":
        filtered_words.append(filtered_word)
print(*filtered_words)