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

Iterating over Files in a Directory

Introduction:
Iterating through files in a directory is a crucial task for various software applications. This article provides efficient approaches to achieve this using Python, discussing both Python 3.6 and recursive pathlib methods.

Solution for Python 3.6 Using os:

1. Import os to access the operating system module.
2. Define the directory path as a string object in the variable directory_in_str.
3. Use os.listdir(directory) to list all files within the directory.
4. Iterate over each file using a for loop and extract its filename using os.fsdecode(file).
5. Check the file extension using endswith(".asm") or endswith(".py") to identify files of interest.
6. Perform necessary actions on the identified files.

Code Example:

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

Solution Using pathlib for Recursive Iteration:

1. Import Path from the pathlib module.
2. Create a pathlist by calling Path.glob('**/*.asm') or Path.rglob('*.asm') on the directory path.
3. Iterate over each path in the pathlist.
4. Convert each path object to a string using str(path) for further processing.

Code Example:

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)

These methods offer effective solutions for iterating over files in a given directory, allowing developers to perform various operations on specific file types efficiently.

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