files-size.py

# -*- coding: utf-8 -*-
import os

def print_size(size):
    '''打印文件大小'''
    print('Size: {0} Byte'.format(size))
    print('Size: {0} KB'.format(size / 1024))
    print('Size: {0} MB'.format(size / 1024 / 1024))
    print('Size: {0} GB'.format(size / 1024 / 1024 / 1024))

def calc_file_size(root):
    '''计算目录下所有文件大小之和'''
    total_size = 0
    for path, subdirs, files in os.walk(root):
        for _file in files:
            fn = os.path.join(path, _file)
            file_size = 0
            try:
                file_size = os.path.getsize(fn)
            except:
                pass
            total_size += file_size
    print_size(total_size)
    return total_size

root = r'C:\Users\Public'
calc_file_size(root)