How Can I Calculate Directory Size Using Python?

Calculating Directory Size with Python: Unveiling a Comprehensive Solution

Estimating the size of a directory is a common task in programming. Python, with its robust standard library, provides various approaches to tackle this issue.

One method employs the os.walk() function. It traverses the directory tree, accumulates file sizes, and displays the result in a human-readable format:

<code class="python">import os

def get_size(start_path='.'):
    total_size = 0
    for dirpath, dirnames, filenames in os.walk(start_path):
        for f in filenames:
            fp = os.path.join(dirpath, f)
            if not os.path.islink(fp):
                total_size += os.path.getsize(fp)

    return total_size

print(get_size(), 'bytes')</code>

Alternatively, a more concise approach using os.listdir() excludes subdirectories:

<code class="python">import os
sum(os.path.getsize(f) for f in os.listdir('.') if os.path.isfile(f))</code>

For more granular information, os.stat() offers both file and directory statistics. The st_size attribute provides the file size in bytes:

<code class="python">import os

nbytes = sum(d.stat().st_size for d in os.scandir('.') if d.is_file())</code>

Python's recent versions include the pathlib module. Its solution combines functionality from both os and os.path:

<code class="python">from pathlib import Path

root_directory = Path('.')
sum(f.stat().st_size for f in root_directory.glob('**/*') if f.is_file())</code>

These techniques efficiently quantify directory size in Python. Whether selecting os.walk, os.listdir, os.stat, or pathlib, programmers can choose the most suitable method based on their requirements.

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