python 删除某个路径下所有文件及模块调用注意事项

import os
#from os import path
import sys
#from sys import argv
import shutil
directory = sys.argv[1] # need to add "from sys import argv" but not "import sys" , or else it will display "argv is not defined"#
if os.path.isdir(directory): #return true if the pathname refers to an existing directory#
print "path"+" "+ directory + " " + "is exist!"
filelist = os.listdir(directory) #return a list containing the names of the entries in the direcory#
print filelist
for name in filelist: # try to delete a file, and if it is a folder jump to except to delete folder
try:
os.remove(directory +"/"+ name)  # delete files in path "directory"#
except:
print "this is a folder not a file!"
#os.rmdir(directory + "/" + name) # remve(delete) the directory path. only works when the directory is empty
shutil.rmtree(directory +"/"+ name) # delete an entire directory tree.
print "files delete complete!"
else:
print "path"+" "+ directory + " " + "is not exist!"

注意：
1.这段代码如果在开头部分使用importsys,则在应用argv这个模块的时候，要使用directory=os.argv[1]，否则会报“'argv'isnotdefined”的错误;而如果使用fromsysimportargv来导入模块，则可以使用directory=argv[1]。在编写python程序的时候，最好有自己的风格，建议是全部采用importsys,而在应用argv模块的使用，说明清楚该模块是在sys里面的，即sys.argv的。同理，用importos导入os模块时,在应用isdir()，listdir(),remove()等函数时，也必须说明清楚具体的在那个模块里面，即os.path.isdir(),os.listdir(),os.remove().
2.区别os.rmdir()和shutil.rmtree(),前者只能删除一个空文件夹，后者是删除整个目录，空目录和有文件的目录均可删除。