## 問題 你有一些長字符串，想以指定的列寬將它們重新格式化。 ## 解決方案 使用 `textwrap` 模塊來格式化字符串的輸出。比如，假如你有下列的長字符串： s = "Look into my eyes, look into my eyes, the eyes, the eyes, \ the eyes, not around the eyes, don't look around the eyes, \ look into my eyes, you're under." 下面演示使用 `textwrap` 格式化字符串的多種方式： >>> import textwrap >>> print(textwrap.fill(s, 70)) Look into my eyes, look into my eyes, the eyes, the eyes, the eyes, not around the eyes, don't look around the eyes, look into my eyes, you're under. >>> print(textwrap.fill(s, 40)) Look into my eyes, look into my eyes, the eyes, the eyes, the eyes, not around the eyes, don't look around the eyes, look into my eyes, you're under. >>> print(textwrap.fill(s, 40, initial_indent=' ')) Look into my eyes, look into my eyes, the eyes, the eyes, the eyes, not around the eyes, don't look around the eyes, look into my eyes, you're under. >>> print(textwrap.fill(s, 40, subsequent_indent=' ')) Look into my eyes, look into my eyes, the eyes, the eyes, the eyes, not around the eyes, don't look around the eyes, look into my eyes, you're under. ## 討論 `textwrap` 模塊對于字符串打印是非常有用的，特別是當你希望輸出自動匹配終端大小的時候。你可以使用 `os.get_terminal_size()` 方法來獲取終端的大小尺寸。比如： >>> import os >>> os.get_terminal_size().columns 80 >>> `fill()` 方法接受一些其他可選參數來控制tab，語句結尾等。參閱 [textwrap.TextWrapper文檔](https://docs.python.org/3.3/library/textwrap.html#textwrap.TextWrapper) 獲取更多內容。