How Can I Efficiently Iterate Through Files in a Specific Directory in Python?

Iterating Through Files in a Given Directory

In a programming context, you may encounter a need to process or manipulate files within a specific directory. Here's a straightforward approach to efficiently iterate through files in a given directory.

Python 3.6 Solution

Python's os module provides the listdir() function to list files within a directory. Assuming your directory path is stored in a string variable (directory), the following code snippet lists .asm files:

import os

directory = os.fsencode(directory)

for file in os.listdir(directory):
    filename = os.fsdecode(file)
    if filename.endswith(".asm"): 
        # Perform actions on .asm files
        continue
    else:
        continue

Pathlib Recursion

Pathlib offers a recursive approach. Using the Path object, you can search for .asm files within subdirectories as well:

from pathlib import Path

pathlist = Path(directory).rglob('**/*.asm')
for path in pathlist:
    path_in_str = str(path)
    # Perform actions on .asm files

Original Answer

The code below provides a simple example:

import os

for filename in os.listdir("/path/to/dir/"):
    if filename.endswith(".asm") or filename.endswith(".py"): 
        # Perform actions on .asm and .py files
        continue
    else:
        continue

This code iterates through all files in a directory, filtering for files with the specified extensions. When an eligible file is found, you can perform necessary actions within the continue block. Importantly, the exclusion of files using else ensures that only relevant files are processed.

By following these approaches, you can efficiently iterate through files in a given directory, opening up possibilities for various file processing tasks.

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