一个检查文件夹下文件大小的小程序

#!/usr/bin/env python3
# -*- coding:utf-8 -*-

"选择盘符或选择文件夹，在桌面生成Log文件，将选择目录下文件按由大到小排列"

import os
from tkinter import *
from tkinter.ttk import *
from tkinter.filedialog import *
import threading

filelist = []

def formatSize(size, is1024=True):
"格式化文件大小"
formatUnit = {1024: ['KB', 'MB', 'GB', 'TB'], 1000: ['KiB', 'MiB', 'GiB', 'TiB']}
block = 1024 if is1024 else 1000
for unit in formatUnit[block]:
size /= block
if size < block:
return "{0:.2f}{1}".format(size, unit)
raise ValueError('文件过大')

def scanDir(beginPath='E:\\'):
# print('Current Path: {}'.format(beginPath))
try:
for item in os.scandir(beginPath):
if item.is_file():
path = os.path.join(beginPath, item.name)
# print('当前文件: {}'.format(path))
size = item.stat().st_size
filelist.append([path, size])
else:
# pass
path = os.path.join(beginPath, item.name)
# print("目录: {}".format(path))
scanDir(path)
except PermissionError:
print('访问拒绝:{}'.format(beginPath))

def outPut(logPath=os.path.join(os.path.expanduser('~'),'Desktop','log.txt')):
newlist = sorted(filelist, key=lambda x:x[1], reverse=True)
with open(logPath,'w') as f:
f.write("{:>6}   {}\n".format("大小","路径"))
for file in newlist:
f.write("{:>10} {}\n".format(formatSize(file[1]),file[0]))

def test():
scanDir()
outPut()

def main():
def func(getpath):
scanDir(getpath)
outPut()
print('文件搜索完成')
def showMsg(*args):
basePath = {"C": "C:\\", "D": "D:\\", "E": "E:\\", "F": "F:\\"}
root.update()
threading.Thread(target=func,args=(basePath[path.get()],)).start()
return
def go(*args):
threading.Thread(target=func, args=(enter.get(),)).start()
return
def search(*args):
enter.set(askdirectory())
root = Tk()
root.title("文件大小查看")
path = StringVar()
selectPath = Combobox(root, textvariable=path, values=["C","D","E","F"])
selectPath.current(0)
checkbtn = Button(root,text="Go",command=go)
enter = StringVar()
enterPath = Button(root, textvariable=enter, command=search)
enter.set("请选择一个文件夹")
selectPath.bind("<<ComboboxSelected>>", showMsg)
selectPath.pack(fill=X)
enterPath.pack(side="left")
checkbtn.pack(fill=X)
root.mainloop()

if __name__=="__main__":
main()