Generate a set of characters that appear exactly twice in a string
This Python code uses a set comprehension to create a set named twice_chars, which contains characters that appear exactly twice in the string string. Here's how the code works:
- twice_chars = {char for char in string if string.count(char) == 2}: This line initializes the set twice_chars using a set comprehension.
- for char in string: This part of the code iterates through each character in the string string.
- if string.count(char) == 2: It checks whether the count of the current character in the string is equal to 2, meaning the character appears exactly twice in the string.
- print(string): This line of code prints the original string, which is "Hello, world!", to the console.
- print(twice_chars): This line of code prints the twice_chars set, which contains characters that appear exactly twice in the string, to the console.
Source Code
string = "Hello, world!"
twice_chars = {char for char in string if string.count(char) == 2}
print(string)
print(twice_chars)
Output
Hello, world!
{'o'}