译(二十九)-Python按行读取文件并存进列表

stackoverflow热门问题目录

如有翻译问题欢迎评论指出,谢谢。

如何按行读取文件并存进列表?

  • Julie Raswick asked:

    • Python如何读取一个文件的每一行,并将其存进列表里?
    • 按行读取,然后追加到列表末尾。
  • Answers:

    • SilentGhost – vote: 2450

    • 下面的代码可以读取文件至内存,并且移除每行的空白字符(换行符与空格):

    • with open(filename) as file:
        lines = file.readlines()`    
        lines = [line.rstrip() for line in lines]
    • 如果是读取大文件,最后按行读取并处理:

    • with open(filename) as file:
        for line in file:    
            print(line.rstrip())
    • Python3.8可以用带海象运算符的while循环(译者注::=长得像海象,所以这么叫,文档里说的):

    • with open(filename) as file:
       while (line := file.readline().rstrip()):    
           print(line)```
    • 根据文件的处理需求与编码方式来设置不同的读取方式与编码方式:

    • with open(filename, 'r', encoding='UTF-8') as file:
       while (line := file.readline().rstrip()):  
           print(line)```
    • Felix Kling – vote: 1108

    • 输入与输出

    • with open('filename') as f:
       lines = f.readlines()```
    • 或者去除换行符:

    • with open('filename') as f:
        lines = [line.rstrip() for line in f]```
    • robert – vote: 667

    • 虽然这不简洁,但的确如要求一般:

    • with open(file.txt) as file_in:
       lines = []  
       for line in file_in:    
           lines.append(line)```

How to read a file line-by-line into a list?

  • Julie Raswick asked:

    • How do I read every line of a file in Python and store each line as an element in a list?
      Python如何读取一个文件的每一行,并将其存进列表里?
    • I want to read the file line by line and append each line to the end of the list.
      按行读取,然后追加到列表末尾。
  • Answers:

    • SilentGhost – vote: 2450

    • This code will read the entire file into memory and remove all whitespace characters (newlines and spaces) from the end of each line:
      下面的代码可以读取文件至内存,并且移除每行的空白字符(换行符与空格):

    • with open(filename) as file:
        lines = file.readlines()`    
        lines = [line.rstrip() for line in lines]
    • If you\’re working with a large file, then you should instead read and process it line-by-line:
      如果是读取大文件,最后按行读取并处理:

    • with open(filename) as file:
        for line in file:    
            print(line.rstrip())
    • In Python 3.8 and up you can use a while loop with the walrus operator like so:
      Python3.8可以用带海象运算符的while循环(译者注::=长得像海象,所以这么叫,文档里说的):

    • with open(filename) as file:
       while (line := file.readline().rstrip()):    
           print(line)```
    • Depending on what you plan to do with your file and how it was encoded, you may also want to manually set the access mode and character encoding:
      根据文件的处理需求与编码方式来设置不同的读取方式与编码方式:

    • with open(filename, 'r', encoding='UTF-8') as file:
       while (line := file.readline().rstrip()):  
           print(line)```
    • Felix Kling – vote: 1108

    • See Input and Ouput:
      输入与输出

    • with open('filename') as f:
       lines = f.readlines()```
    • or with stripping the newline character:
      或者去除换行符:

    • with open('filename') as f:
        lines = [line.rstrip() for line in f]```
    • robert – vote: 667

    • This is more explicit than necessary, but does what you want.
      虽然这不简洁,但的确如要求一般:

    • with open(file.txt) as file_in:
       lines = []  
       for line in file_in:    
           lines.append(line)```

You may also like...

发表评论

您的电子邮箱地址不会被公开。 必填项已用*标注