Find all files in a directory with extension .txt

Question

How can I find all the files in a directory having the extension .txt in python?

Answer 1

Many users have replied with os.walk answers, which includes all files but also all directories and subdirectories and their files.

import os


def files_in_dir(path, extension=''):
    """
       Generator: yields all of the files in <path> ending with
       <extension>

       \param   path       Absolute or relative path to inspect,
       \param   extension  [optional] Only yield files matching this,

       \yield              [filenames]
    """


    for _, dirs, files in os.walk(path):
        dirs[:] = []  # do not recurse directories.
        yield from [f for f in files if f.endswith(extension)]

# Example: print all the .py files in './python'
for filename in files_in_dir('./python', '*.py'):
    print("-", filename)

Or for a one off where you don't need a generator:

path, ext = "./python", ext = ".py"
for _, _, dirfiles in os.walk(path):
    matches = (f for f in dirfiles if f.endswith(ext))
    break

for filename in matches:
    print("-", filename)

If you are going to use matches for something else, you may want to make it a list rather than a generator expression:

    matches = [f for f in dirfiles if f.endswith(ext)]

Answer 2

import glob,os

data_dir = 'data_folder/'
file_dir_extension = os.path.join(data_dir, '*.txt')

for file_name in glob.glob(file_dir_extension):
    if file_name.endswith('.txt'):
        print file_name

For me. It's classic.

Answer 3

use Python OS module to find files with specific extension.

the simple example is here :

import os

# This is the path where you want to search
path = r'd:'  

# this is extension you want to detect
extension = '.txt'   # this can be : .jpg  .png  .xls  .log .....

for root, dirs_list, files_list in os.walk(path):
    for file_name in files_list:
        if os.path.splitext(file_name)[-1] == extension:
            file_name_path = os.path.join(root, file_name)
            print file_name
            print file_name_path   # This is the full path of the filter file

Answer 4

Try this this will find all your file inside folder or folder

import glob, os
os.chdir("H:\\wallpaper")# use whatever you directory 

#double\\ no single \

for file in glob.glob("**/*.psd", recursive = True):#your format
    print(file)

Answer 5

You can try this code:

import glob
import os

os.chdir("D:\...\DirName")
filename_arr={}
i=0
for files in glob.glob("*.txt"):
    filename_arr[i] = files
    i= i+1

for key,value in filename_arr.items():
    print key , value

Answer 6

I did a test (Python 3.6.4, W7x64) to see which solution is the fastest for one folder, no subdirectories, to get a list of complete file paths for files with a specific extension.

To make it short, for this task os.listdir() is the fastest and is 1.7x as fast as the next best: os.walk() (with a break!), 2.7x as fast as pathlib, 3.2x faster than os.scandir() and 3.3x faster than glob.
Please keep in mind, that those results will change when you need recursive results. If you copy/paste one method below, please add a .lower() otherwise .EXT would not be found when searching for .ext.

import os
import pathlib
import timeit
import glob

def a():
    path = pathlib.Path().cwd()
    list_sqlite_files = [str(f) for f in path.glob("*.sqlite")]

def b(): 
    path = os.getcwd()
    list_sqlite_files = [f.path for f in os.scandir(path) if os.path.splitext(f)[1] == ".sqlite"]

def c():
    path = os.getcwd()
    list_sqlite_files = [os.path.join(path, f) for f in os.listdir(path) if f.endswith(".sqlite")]

def d():
    path = os.getcwd()
    os.chdir(path)
    list_sqlite_files = [os.path.join(path, f) for f in glob.glob("*.sqlite")]

def e():
    path = os.getcwd()
    list_sqlite_files = [os.path.join(path, f) for f in glob.glob1(str(path), "*.sqlite")]

def f():
    path = os.getcwd()
    list_sqlite_files = []
    for root, dirs, files in os.walk(path):
        for file in files:
            if file.endswith(".sqlite"):
                list_sqlite_files.append( os.path.join(root, file) )
        break



print(timeit.timeit(a, number=1000))
print(timeit.timeit(b, number=1000))
print(timeit.timeit(c, number=1000))
print(timeit.timeit(d, number=1000))
print(timeit.timeit(e, number=1000))
print(timeit.timeit(f, number=1000))

Results:

# Python 3.6.4
0.431
0.515
0.161
0.548
0.537
0.274