Python - How to list all the files
在 Python 開發中，遞迴列出目錄及子目錄下的所有檔案是常見需求。本文分享如何使用內建的 glob 模組，透過簡潔的通配符語法快速取得完整檔案清單。這是一篇掌握檔案系統操作與目錄遍歷技巧的實用技術隨筆。
Sometimes, we need to list all the files in a folder or sub folder in Python.
In this post, I will show you how to use the glob function to achieve this.
Solution
First, let’s take a look at the file structure of the example.1
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10./data
├── level-0-0
│ └── file-0.txt
├── level-0-1
│ ├── file-1.txt
│ └── file-2.txt
├── level-0-2
├── file-3.txt
├── file-4.txt
├── file-5.txt
List all the files in single current folder
Now, we can do this by the following code.1
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4import glob
files = glob.glob('./data/*.txt')
for file in files:
print(file)
Here is the output.1
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3./data/file-5.txt
./data/file-4.txt
./data/file-3.txt
List all the files in folder recursively
However, we also can list all the files recursively.1
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4import glob
files = glob.glob('./data/**/*.txt', recursive=True)
for file in files:
print(file)
Now, we can see all the files in data folder.1
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6./data/file-5.txt
./data/file-4.txt
./data/file-3.txt
./data/level-0-1/file-2.txt
./data/level-0-1/file-1.txt
./data/level-0-0/file-0.txt
Tips
Also, we can use regex with glob1
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4import glob
files = glob.glob('./data/**/*[2-3].txt', recursive=True)
for file in files:
print(file)1
2./data/file-3.txt
./data/level-0-1/file-2.txt
🙂