py中的目录与文件判别代码

import os 导入模块
os.listdir("d:\\python25") 列出所有目录和文件
['w9xpopen.exe', 'README.txt', 'NEWS.txt', 'LICENSE.txt', 'python.exe', 'pythonw.exe', 'Lib', 'DLLs', 'include', 'libs', 'tcl', 'Tools', 'Doc', 'odbchelper.py', 'odbchelper.pyc', 'test.log', 'sqlConnection.py', 'sqlConnection.pyc']
dirname="d:\\python25" 支持自定义
os.listdir(dirname)
['w9xpopen.exe', 'README.txt', 'NEWS.txt', 'LICENSE.txt', 'python.exe', 'pythonw.exe', 'Lib', 'DLLs', 'include', 'libs', 'tcl', 'Tools', 'Doc', 'odbchelper.py', 'odbchelper.pyc', 'test.log', 'sqlConnection.py', 'sqlConnection.pyc']
[f for f in os.listdir(dirname) 筛选出一个list，存放filename
if os.path.isfile(os.path.join(dirname, f))]
['w9xpopen.exe', 'README.txt', 'NEWS.txt', 'LICENSE.txt', 'python.exe', 'pythonw.exe', 'odbchelper.py', 'odbchelper.pyc', 'test.log', 'sqlConnection.py', 'sqlConnection.pyc']
[f for f in os.listdir(dirname) 筛选出一个list，存放dirname
if os.path.isdir(os.path.join(dirname, f))]
['Lib', 'DLLs', 'include', 'libs', 'tcl', 'Tools', 'Doc']

判别的应用

os.path.isdir("D:\\")
True
os.path.isdir("D:\\python25\\odbchelper.py")
False
os.path.isfile("D:\\python25\\odbchelper.py")
True

当前目录

os.getcwd()
'D:\\Python25'

通配符的使用，引入glob

IDLE 1.2.1

import glob
glob.glob('D:\\python25\\.exe')
['D:\\python25\\w9xpopen.exe', 'D:\\python25\\python.exe', 'D:\\python25\\pythonw.exe']
glob.glob('D:\\python25\\py.exe')
['D:\\python25\\python.exe', 'D:\\python25\\pythonw.exe']