译（二十九）-Python按行读取文件并存进列表

2022-10-07 07:24:41

文章首发及后续更新：https://mwhls.top/3093.html
新的更新内容请到mwhls.top查看。
无图/无目录/格式错误/更多相关请到上方的文章首发页面查看。

*热门问题目录

如有翻译问题欢迎评论指出，谢谢。

目录 1. 如何按行读取文件并存进列表？ 2. How to read a file line-by-line into a list?

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
见输入与输出

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:
    见输入与输出
  - ```
  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)```
```

码农公寓

如何按行读取文件并存进列表？

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

相关文章