Python创建删除文件

import os
directory = "E:\\学习日志\\"
os.chdir(directory) # 改变当前工作目录
cwd = os.getcwd() # 查看当前工作目录
print("--------------current working directory : " + cwd + "----------")def deleteBySize(minSize):
"""删除小于minSize的文件（单位：K）"""
files = os.listdir(os.getcwd()) # 列出目录中文件
for file in files:
## print file + " : " + str(os.path.getsize(file))
if os.path.getsize(file) < minSize * 1000:
os.remove(file)
print(file + " deleted.")
returndef deleteNullFile():
'''删除所有大小为0的文件'''
files = os.listdir(os.getcwd()) # 列出目录中文件
for file in files:
if os.path.getsize(file) == 0: #得到文件大小，如果是目录返回0
os.remove(file)
print(file + " deleted")
returndef create():
'''根据本地时间创建新文件，如果已存在则不创建'''
import time
#将指定的struct_time(默认为当前时间)，根据指定的格式化字符串输出
t = time.strftime('%Y-%m-%d',time.localtime())
suffix = ".docx"
newFile =os.getcwd() + "\\" + t + suffix
if not os.path.exists(newFile):
f = open(newFile,'w')
f.close()
print newFile + " created."
else:
print newFile + " already exist."
returnhint = '''funtion :
1 create new file
2 delete null file
3 delete by size
q quit\n
please input number: '''
while True:
option = raw_input(hint)
if cmp(option,"1") == 0:
create()
elif cmp(option,"2") == 0:
deleteNullFile()
elif cmp(option,"3") == 0:
minSize = raw_input("minSize(K) : ")
deleteBySize(minSize)
elif cmp(option,"q") == 0:
print "quit !"
break
else:
print ("disabled input. please try again...")