python学习--标准库之os 实例（3）

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#列出当前目录下文件的大小和创建日期及文件名，相当于ls -l命令

from datetime import datetime
import os

pwd = os.path.abspath('.')

print('      Size     Last Modified  Name')
print('------------------------------------------------------------')

for f in os.listdir(pwd):
    f_size = os.path.getsize(f)
    if f_size > 1024:
        k_size = round(f_size / 1024, 1)
        f_size = str(k_size) + 'K'
        if k_size > 1024:
            m_size = round(k_size / 1024, 1)
            f_size = str(m_size) + 'M'
            if m_size > 1024:
                g_size = round(m_size / 1024, 1)
                f_size = str(g_size) + 'G'
    else:
        f_size = str(f_size) + 'B'

    mtime = datetime.fromtimestamp(os.path.getmtime(f)).strftime('%Y-%m-%d %H:%M')
    flag = '/' if os.path.isdir(f) else ''
    '''if os.path.isdir(f):
        t = '/'
    else:
        t = ""
    '''
    #print('%10d  %s  %s%s' % (fsize, mtime, f, flag))
    print("{:>10}{:^20}{}{}".format(f_size, mtime, f, flag))