在不同长度的字符串中查找不同的字符

def find_different_characters(str1, str2):
    char_map = {}
    result = []
    
    # 遍历str1，将字符存储在哈希表中
    for char in str1:
        char_map[char] = 1
    
    # 遍历str2，将在str1中存在的字符的值设为0
    for char in str2:
        if char in char_map:
            char_map[char] = 0
    
    # 遍历哈希表，将值为1的键输出
    for char, value in char_map.items():
        if value == 1:
            result.append(char)
    
    return result

# 测试示例
str1 = "abcdefg"
str2 = "abcxyz"
result = find_different_characters(str1, str2)
print(result)  # 输出 ['d', 'e', 'f', 'g']