如何在Python中列出目录中的所有文件并将其添加到列表中?


当前回答

从3.4版开始,有内置的迭代器,比os.listdir()高效得多:

pathlib:3.4版新增。

>>> import pathlib
>>> [p for p in pathlib.Path('.').iterdir() if p.is_file()]

根据PEP428,pathlib库的目的是提供一个简单的类层次结构来处理文件系统路径和用户对它们进行的常见操作。

os.scandir():3.5版新增。

>>> import os
>>> [entry for entry in os.scandir('.') if entry.is_file()]

注意,os.walk()使用os.scandir()而不是3.5版的os.listdir(),根据PEP471,它的速度提高了2-20倍。

让我也推荐阅读ShadowRanger在下面的评论。

其他回答

def list_files(path):
    # returns a list of names (with extension, without full path) of all files 
    # in folder path
    files = []
    for name in os.listdir(path):
        if os.path.isfile(os.path.join(path, name)):
            files.append(name)
    return files 

如果您正在寻找find的Python实现,这是我经常使用的方法:

from findtools.find_files import (find_files, Match)

# Recursively find all *.sh files in **/usr/bin**
sh_files_pattern = Match(filetype='f', name='*.sh')
found_files = find_files(path='/usr/bin', match=sh_files_pattern)

for found_file in found_files:
    print found_file

所以我用它制作了一个PyPI包,还有一个GitHub存储库。我希望有人发现它对这段代码可能有用。

import os
os.listdir("somedirectory")

将返回“somedirectory”中所有文件和目录的列表。

仅获取文件列表(无子目录)的单行解决方案:

filenames = next(os.walk(path))[2]

或绝对路径名:

paths = [os.path.join(path, fn) for fn in next(os.walk(path))[2]]

从目录及其所有子目录获取完整文件路径

import os

def get_filepaths(directory):
    """
    This function will generate the file names in a directory 
    tree by walking the tree either top-down or bottom-up. For each 
    directory in the tree rooted at directory top (including top itself), 
    it yields a 3-tuple (dirpath, dirnames, filenames).
    """
    file_paths = []  # List which will store all of the full filepaths.

    # Walk the tree.
    for root, directories, files in os.walk(directory):
        for filename in files:
            # Join the two strings in order to form the full filepath.
            filepath = os.path.join(root, filename)
            file_paths.append(filepath)  # Add it to the list.

    return file_paths  # Self-explanatory.

# Run the above function and store its results in a variable.   
full_file_paths = get_filepaths("/Users/johnny/Desktop/TEST")

我在上述函数中提供的路径包含3个文件,其中两个位于根目录中,另一个位于名为“subfolder”的子文件夹中打印将打印列表的完整文件路径:['/Users/johnny/Desktop/TEST/file1.txt','/Users/johnny/Desctop/TEST-file2.txt','/Users/johnny/Desktop/STEST/SUBFOLDER/file3.dat']

如果愿意,您可以打开并阅读内容,或者只关注扩展名为“.dat”的文件,如下面的代码所示:

for f in full_file_paths:
  if f.endswith(".dat"):
    print f

/用户/johnny/Desktop/TEST/SUBFOLDER/file3.dat