python 遍历文件转为UTF8-bom 格式

import os
import sys
import codecs

""" 给指定文件，添加BOM标记
    参数:
        file: 文件
        bom: BOM标记
"""
def add_bom(file, bom: bytes):
    print("now,add_bom for file :[%s] ,with bom:[%s]" %(file,bom))
    with open(file, 'r+b') as f:
        org_contents = f.read()
        f.seek(0)
        f.write(bom + org_contents)


filePathSrc = 'D:\02-mystudycodespace\codes'
for root,dirs,files in os.walk(filePathSrc):
    for fn in files:
        if fn[-2:] == '.h':
            add_bom(filePathSrc+"\" + fn, codecs.BOM_UTF8)


for root,dirs,files in os.walk(filePathSrc):
    for fn in files:
        if fn[-4:] == '.cpp':
            add_bom(filePathSrc+"\" + fn, codecs.BOM_UTF8)