如何读取用户的单个字符？

import sys

def read_single_char():
    if sys.stdin.isatty():
        char = input("请输入一个字符: ")[0]
    else:
        char = sys.stdin.read(1)
    return char

if __name__ == "__main__":
    char = read_single_char()
    print(f"你输入的字符是: {char}")

#include <iostream>

char read_single_char() {
    char ch;
    std::cin >> ch;
    return ch;
}

int main() {
    char ch = read_single_char();
    std::cout << "你输入的字符是: " << ch << std::endl;
    return 0;
}

import sys

def read_single_char():
    if sys.stdin.isatty():
        char = input("请输入一个字符: ")[0]
    else:
        char = sys.stdin.read(1)
    return char

import sys

def read_single_char():
    if sys.stdin.isatty():
        char = input("请输入一个字符: ")[0]
    else:
        char = sys.stdin.read(1)
    return char