# -*- coding:utf-8 -*-
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)
            total_size += os.path.getsize(fp)
    return total_size
print get_size()

import os
import functools as F
def collect_files(files, dirname, fnames):
    files += map(F.partial(os.path.join, dirname), fnames)
files = []
os.path.walk('/tmp', collect_files, files)
total_size = sum(map(os.path.getsize, files))