Python文件操作

一、查看目录或文件是否存在
import os
os.path.exists(mydir)
注意的是：mydir类似于
mydir='C:/Program Files/WinRAR' 一定不用加双引号，如：
mydir='"C:/Program Files/WinRAR"'，否则会出错的。
二、建立目录
import os
#建立一级目录
os.mkdir(mydir)
#建立多级目录
makedirs(mydirs)
三、遍历目录得到文件和目录的列表
来自于PythonCook。

import os, fnmatch def listFiles(root, patterns='*', recurse=1, return_folders=0): # Expand patterns from semicolon-separated string to list pattern_list = patterns.split(';') # Collect input and output arguments into one bunch class Bunch: def __init__(self, **kwds): self.__dict__.update(kwds) arg = Bunch(recurse=recurse, pattern_list=pattern_list, return_folders=return_folders, results=[]) def visit(arg, dirname, files): # Append to arg.results all relevant files (and perhaps folders) for name in files: fullname = os.path.normpath(os.path.join(dirname, name)) if arg.return_folders or os.path.isfile(fullname): for pattern in arg.pattern_list: if fnmatch.fnmatch(name, pattern): arg.results.append(fullname) break # Block recursion if recursion was disallowed if not arg.recurse: files[:]=[] os.path.walk(root, visit, arg) return arg.results

举例：

thefiles = listFiles('/tmp', '*.py;*.htm;*.html')