讀文件

def read_file(filepath):
    with open(filepath, 'r', encoding='utf-8') as file:
        for line in file:
            print(line)

寫文件

def write_file(filepath):
    with open(filepath, 'w', encoding='utf-8') as file:
        file.write('hello world')

讀寫文件

def read_write_file(filepath):
    with open(filepath, 'r+', encoding='utf-8') as file:
        text = file.read()
        # 處理文本
        text = re.sub('python', 'python3', text)
        # 默認是在最后追加，以下方法可覆蓋
        file.seek(0)
        file.truncate()
        # 寫入
        file.write(text)

https://stackoverflow.com/a/13464228/3355097