dirsize.py

import os

def get_size_dir(path='.'):
    total_size = 0
    for dir_path in os.listdir(path):
        full_path = os.path.join(path, dir_path)
        if os.path.isfile(full_path):
            total_size += os.path.getsize(full_path)
        elif os.path.isdir(full_path):
            total_size += get_size_dir(full_path)
    return total_size

print(get_size_dir('.'))