如何将一行字符串中的所有数字相加

def sum_numbers_in_string(string):
    total = 0
    current_number = ""
    
    for char in string:
        if char.isdigit():
            current_number += char
        elif current_number:
            total += int(current_number)
            current_number = ""
    
    if current_number:
        total += int(current_number)
    
    return total

# 示例用法
string = "abc123def456ghi789"
result = sum_numbers_in_string(string)
print(result)  # 输出：136