Python sys&os模块

1.sys模块实现的进度条

import sys
import time
def view_bar(num):
    for i in range(num):
        time.sleep (0.5)
        ret = "
%s%d%%"%((i+1)*"=",i+1)
        sys.stdout.write(ret)
        sys.stdout.flush()

if __name__ == '__main__':
    view_bar(10)

2.OS模块

import os
# print (os.getcwd())    D:Pythonday6
# print (os.curdir)  .
# print (os.pardir) ..
# os.makedirs("dir1/dir2/dir3")    在getcwd()的目录下新建dir1/dir2/dir3
# os.removedirs("dir1/dir2/dir3")   在getcwd()的目录下删除了dir1/dir2/dir3
# print (os.stat("s1.py"))   os.stat_result(st_mode=33206, st_ino=15199648742533178, st_dev=1121161508, st_nlink=1, st_uid=0, st_gid=0, st_size=335, st_atime=1469633380, st_mtime=1469633380, st_ctime=1469547918)
# print (os.path.join("d:pythonday6","lib","commons.py"))   d:pythonday6libcommons.py
# print (os.path.join("d:pythonday6","lib"))   d:pythonday6lib