Python字符串中数字与英文数字的智能提取与高效求和教程

def find_first_number(text_string):
    """
    从字符串的开头查找第一个数字（数字字符或英文拼写）。
    例如："oneight" -> 1, "2abc" -> 2
    """
    number_words = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]

    # 遍历字符串，逐个字符检查
    for i in range(len(text_string)):
        current_substring = text_string[i:]

        # 优先检查是否为数字字符
        if current_substring[0].isdigit():
            return int(current_substring[0])

        # 检查是否为英文拼写数字
        for value, word in enumerate(number_words):
            if current_substring.startswith(word):
                return value
    return None # 如果没有找到任何数字，返回None

def find_last_number(text_string):
    """
    从字符串的结尾查找最后一个数字（数字字符或英文拼写）。
    例如："oneight" -> 8, "abc2" -> 2
    """
    number_words = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]

    # 从字符串末尾开始向前遍历
    for i in range(len(text_string) - 1, -1, -1):
        current_substring = text_string[:i+1] # 每次截取从开头到当前位置的子串

        # 优先检查是否为数字字符
        if current_substring[-1].isdigit():
            return int(current_substring[-1])

        # 检查是否为英文拼写数字
        for value, word in enumerate(number_words):
            if current_substring.endswith(word):
                return value
    return None # 如果没有找到任何数字，返回None

def concatenate_numbers(num1, num2):
    """将两个数字拼接成一个整数"""
    return int(f"{num1}{num2}")

def process_calibration_document(file_path):
    """
    处理校准文档，提取每行的首尾数字并求和。
    """
    total_sum = 0
    try:
        with open(file_path, 'r') as f:
            for line in f:
                line = line.strip() # 移除行尾的换行符和空格
                if not line: # 跳过空行
                    continue

                first_digit = find_first_number(line)
                last_digit = find_last_number(line)

                if first_digit is not None and last_digit is not None:
                    combined_number = concatenate_numbers(first_digit, last_digit)
                    total_sum += combined_number
                else:
                    print(f"警告: 无法从 '{line}' 中提取首尾数字。")
        return total_sum
    except FileNotFoundError:
        print(f"错误: 文件 '{file_path}' 未找到。")
        return 0
    except Exception as e:
        print(f"处理文件时发生错误: {e}")
        return 0

# 示例用法
if __name__ == "__main__":
    document_path = 'textdocument.txt' # 确保文件存在且路径正确
    final_result = process_calibration_document(document_path)
    print(f"最终的校准总和为: {final_result}")