Python实现文本文件单词逐行写入新文件教程

def words_from_file(filename1, filename2):
    try:
        # 打开源文件用于读取
        with open(filename1, 'r') as f:
            # 打开目标文件用于写入，'w'模式会覆盖原有内容
            with open(filename2, 'w') as g:
                # ... 后续处理逻辑
    except FileNotFoundError:
        print("错误：文件未找到。请检查文件路径是否正确。")
    except Exception as e:
        print(f"发生未知错误：{e}")

                for line in f:  # 逐行读取源文件
                    words = line.split()  # 将当前行拆分为单词列表
                    # ... 逐词写入

                    for word in words:
                        g.write(word + '\n')  # 写入单词并添加换行符

def words_from_file(filename1, filename2):
    """
    读取指定文本文件，将其内容拆分为单词，
    并将每个单词逐行写入一个新的文件。

    Args:
        filename1 (str): 源文件的路径。
        filename2 (str): 目标文件的路径，处理后的单词将写入此文件。
    """
    try:
        with open(filename1, 'r') as f:
            with open(filename2, 'w') as g:
                for line in f:
                    words = line.split()  # 默认按空白字符分割
                    for word in words:
                        g.write(word + '\n')
        print(f"文件 '{filename1}' 已成功处理，单词已写入 '{filename2}'。")
    except FileNotFoundError:
        print(f"错误：文件 '{filename1}' 未找到。请检查文件路径是否正确。")
    except Exception as e:
        print(f"处理文件时发生未知错误：{e}")

# --- 使用示例 ---

# 1. 创建一个示例输入文件 (input.txt)
# 假设 input.txt 包含以下内容：
# It is a sample file.
# This is another line.

with open("input.txt", "w") as f_in:
    f_in.write("It is a sample file.\n")
    f_in.write("This is another line.\n")
    f_in.write("One_word\n") # 包含下划线的单词

print("已创建示例输入文件 'input.txt'。")

# 2. 调用函数进行处理
words_from_file("input.txt", "output.txt")

# 3. 验证输出文件内容 (output.txt)
print("\n'output.txt' 文件内容：")
try:
    with open("output.txt", "r") as f_out:
        print(f_out.read())
except FileNotFoundError:
    print("输出文件 'output.txt' 未生成。")

# --- 预期 output.txt 内容 ---
# It
# is
# a
# sample
# file.
# This
# is
# another
# line.
# One_word