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将文本文件读入 Python

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将文本文件读入 Python 是 CoddyKit 上的免费 NLP Academy 课时。这是第 2 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 NLP Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 NLP Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Real Text Lives in Files

Most NLP work starts with documents stored on disk. Your first job is to load that text from a file into a Python string. 📄

Open a File With open

The open function connects Python to a file. You give it a path and a mode like r, which means read.

f = open("notes.txt", "r")
text = f.read()
f.close()

Read the Whole File

The read method pulls the entire file into one string. That is handy for small documents you want to process all at once.

content = f.read()
print(len(content))  # total characters

Always Close What You Open

An open file holds a system resource. Forgetting to close it can lose data or leak handles, so closing matters.

The with Statement Is Safer

A with block opens the file and closes it automatically when you are done, even if an error happens partway through.

with open("notes.txt", "r") as f:
    text = f.read()

Always Set the Encoding

Pass encoding so Python decodes bytes correctly. Using utf-8 explicitly avoids surprises across different machines.

with open("notes.txt", encoding="utf-8") as f:
    text = f.read()

Read Line by Line

Looping over the file object yields one line at a time. This is gentle on memory for very large documents.

with open("notes.txt", encoding="utf-8") as f:
    for line in f:
        print(line.strip())

Get All Lines as a List

The readlines method returns every line as a list of strings, which is useful when you want to index or count lines.

lines = f.readlines()
print(len(lines))  # number of lines

Lines Keep Their Newline

Each read line ends with a hidden newline character. Call strip to remove that trailing whitespace before processing.

clean = line.strip()

Handle Missing Files

If the path is wrong, Python raises a FileNotFoundError. Wrap risky reads in try and except to fail gracefully.

try:
    open("missing.txt")
except FileNotFoundError:
    print("No such file")

Paths Matter

A relative path is read from where you run the script. When in doubt, use a full path so Python finds the right file.

Quick Check

Think about why one way of opening files is preferred.

Recap: Loading Text Safely

You learned to open files with a with block, set utf-8 encoding, read whole text or line by line, and handle missing files. 📥

常见问题解答

「将文本文件读入 Python」课时是免费的吗？

是的 — 「将文本文件读入 Python」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 NLP Academy 课程的其余内容，请升级到 CoddyKit PRO。 NLP Academy 课程共包含 4 节课。

「将文本文件读入 Python」这节课中我会学到什么？

打开文档并加载其内容你通过在浏览器中直接运行的动手代码来练习 NLP Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 NLP Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 NLP Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 2 节课，共 4 节。

「将文本文件读入 Python」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 NLP Academy 课中编写并运行代码吗？

能。每节 NLP Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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