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[译] [502] 本章小结 #18

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本章小结

  • A loop is used to repeat code as many times as needed.
  • We use a for loop when we know how many iterations the loop will do; we use a while loop when we don’t know how many iterations a loop will do.
  • Python uses indentation to determine which lines of code go together.
  • A dictionary is a mapping from keys (such as words) to values (such as their frequencies).
  • We need to open a file before we can read from it.
  • Once a file is open, we can use methods or a loop to read its lines.
  • Some modules (such as csv and zipfile) come with Python and can be used by importing them.
  • Other modules, such as matplotlib, need to be installed first before they can be imported and used.
  • 循环用于根据需要重复执行代码多次。
  • 当我们明确知道循环将执行的迭代次数时,使用 for 循环;而在不确定循环将执行多少次迭代时,则采用 while 循环。
  • Python 通过缩进来判断哪些代码行应该组合在一起。
  • 字典是从键(例如单词)到值(例如它们的频率)的映射。
  • 我们必须先打开一个文件,才能开始从中读取数据。
  • 文件打开后,我们可以使用方法或循环来逐行读取。
  • 一些模块(如 csv 和 zipfile)是 Python 自带的,可以直接通过导入来使用。
  • 其他模块,例如 matplotlib,需先安装之后才能导入和使用。

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