Iterate Through Every File in One Directory

How can I iterate over files in a given directory?

Python 3.6 version of the above answer, using os - assuming that you have the directory path as a str object in a variable called directory_in_str:

import os

directory = os.fsencode(directory_in_str)
    
for file in os.listdir(directory):
     filename = os.fsdecode(file)
     if filename.endswith(".asm") or filename.endswith(".py"): 
         # print(os.path.join(directory, filename))
         continue
     else:
         continue

Or recursively, using pathlib:

from pathlib import Path

pathlist = Path(directory_in_str).glob('**/*.asm')
for path in pathlist:
     # because path is object not string
     path_in_str = str(path)
     # print(path_in_str)

Use rglob to replace glob('**/*.asm') with rglob('*.asm')
- This is like calling Path.glob() with '**/' added in front of the given relative pattern:

from pathlib import Path

pathlist = Path(directory_in_str).rglob('*.asm')
for path in pathlist:
     # because path is object not string
     path_in_str = str(path)
     # print(path_in_str)

Original answer:

import os

for filename in os.listdir("/path/to/dir/"):
    if filename.endswith(".asm") or filename.endswith(".py"): 
         # print(os.path.join(directory, filename))
        continue
    else:
        continue

How to iterate over all files in multiple folders with python

You can use the below sample snippet both #1 or #2 works:

import os
path = "."
for (root, dirs, files) in os.walk(path, topdown=True):
    for file in files:
        if file.endswith(".html"):
            print(root+"/"+file)                #1
            print(os.path.join(root+"/"+file))  #2

How can I iterate over all files in all folders of one master folder?

You can use os.walk()

import os

path = 'c:\\projects\\hc2\\'

files = []
# r=root, d=directories, f = files
for r, d, f in os.walk(path):
    for file in f:
        if '.txt' in file:
            files.append(os.path.join(r, file))

for f in files:
    print(f)

Output:

c:\projects\hc2\app\readme.txt
c:\projects\hc2\app\release.txt
c:\projects\hc2\web\readme.txt
c:\projects\hc2\whois\download\afrinic.txt
c:\projects\hc2\whois\download\apnic.txt
c:\projects\hc2\whois\download\arin.txt
c:\projects\hc2\whois\download\lacnic.txt
c:\projects\hc2\whois\download\ripe.txt
c:\projects\hc2\whois\out\test\resources\asn\afrinic\3068.txt
c:\projects\hc2\whois\out\test\resources\asn\afrinic\37018.txt

Write code to iterate all files in a directory and append each file's path to a dictionary

I changed files_dir = {} line to

files_in_dir = { key:0 for key in os.listdir(args.source_dir) if os.path.abspath(key).endswith(".csv") }

and it seems work.

if-else in for statement version following requests:

for key in os.listdir(args.source_dir):
    if os.path.abspath(key).endswith(".csv"):
        files_in_dir[key] = 0
    else:
        print(f"The file {key} is not a .csv file and it will be ignored")

How do I iterate through all files inside a given directory and create folders and move the file?

Try this:

import os
import shutil

path = r"C:\Users\vasudeos\OneDrive\Desktop\newfolder"

for x in os.listdir(path):

    file = os.path.join(path, x)

    if not os.path.isdir(file):
        folder_name = os.path.join(path, os.path.splitext(x)[0])

        if not os.path.exists(folder_name):
            os.mkdir(folder_name)

        shutil.move(file, folder_name)

Iterate all files in a directory using a 'for' loop

This lists all the files (and only the files) in the current directory and its subdirectories recursively:

for /r %i in (*) do echo %i

Also if you run that command in a batch file you need to double the % signs.

for /r %%i in (*) do echo %%i

(thanks @agnul)

How do I iterate through the files in a directory and it's sub-directories in Java?

You can use File#isDirectory() to test if the given file (path) is a directory. If this is true, then you just call the same method again with its File#listFiles() outcome. This is called recursion.

Here's a basic kickoff example:

package com.stackoverflow.q3154488;

import java.io.File;

public class Demo {

    public static void main(String... args) {
        File dir = new File("/path/to/dir");
        showFiles(dir.listFiles());
    }

    public static void showFiles(File[] files) {
        for (File file : files) {
            if (file.isDirectory()) {
                System.out.println("Directory: " + file.getAbsolutePath());
                showFiles(file.listFiles()); // Calls same method again.
            } else {
                System.out.println("File: " + file.getAbsolutePath());
            }
        }
    }
}

Note that this is sensitive to StackOverflowError when the tree is deeper than the JVM's stack can hold. If you're already on Java 8 or newer, then you'd better use Files#walk() instead which utilizes tail recursion:

package com.stackoverflow.q3154488;

import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class DemoWithJava8 {

    public static void main(String... args) throws Exception {
        Path dir = Paths.get("/path/to/dir");
        Files.walk(dir).forEach(path -> showFile(path.toFile()));
    }

    public static void showFile(File file) {
        if (file.isDirectory()) {
            System.out.println("Directory: " + file.getAbsolutePath());
        } else {
            System.out.println("File: " + file.getAbsolutePath());
        }
    }
}