What are the methods to remove duplicates and sort strings in Python?

There are several methods in Python for removing duplicates and sorting strings.

1. Use the set() function to remove duplicates: convert the string into a set, which automatically removes duplicates. Then convert the set back into a string. Sample code is as follows:

s = "hello world"
s = ''.join(set(s))
print(s)

1. Sort with the sorted() function: Convert the string to a list, then use the sorted() function to sort the list, and finally convert the sorted list back to a string. Example code is shown below:

s = "hello world"
s = ''.join(sorted(s))
print(s)

1. Remove duplicates using the uniqueness of dictionary keys: Iterate through each character of the string, using each character as a key in the dictionary with arbitrary values, since we only care about the uniqueness of the keys. Finally, convert the dictionary keys back to a string. Example code is shown below:

s = "hello world"
s = ''.join(dict.fromkeys(s))
print(s)

1. Sort using the sorting function of sets: Convert the string to a list, then use the sorted() function to sort the list, and finally convert the sorted list back to a string. Example code is as follows:

s = "hello world"
s = ''.join(sorted(set(s)))
print(s)

Here are some common methods in Python for removing duplicate strings and sorting them. Choose the appropriate method based on your specific needs to solve the problem.