给我转为python3的代码

将给定的Python 2代码转换为Python 3代码需要进行一些语法和函数调用的调整。以下是转换后的代码：

import os
import hashlib
import shutil
import ntpath
import time

CWD = os.getcwd()
FILE_MD5_DICT = {}  # 文件MD5字典
ORIGIN_FILE_LIST = []
Special_path_str = 'drops_JWI96TY7ZKNMQPDRUOSG0FLH41A3C5EXVB82'
bakstring = 'bak_EAR1IBM0JT9HZ75WU4Y3Q8KLPCX26NDFOGVS'
logstring = 'log_WMY4RVTLAJFB28960SC3KZX7EUP1IHOQN5GD'
webshellstring = 'webshell_WMY4RVTLAJFB28960SC3KZX7EUP1IHOQN5GD'
difffile = 'diff_UMTGPJO17F82K35Z0LEDA6QB9WH4IYRXVSCN'
Special_string = 'drops_log'  # 免死金牌
UNICODE_ENCODING = "utf-8"
INVALID_UNICODE_CHAR_FORMAT = r"\?%02x"
spec_base_path = os.path.realpath(os.path.join(CWD, Special_path_str))
Special_path = {
    'bak': os.path.realpath(os.path.join(spec_base_path, bakstring)),
    'log': os.path.realpath(os.path.join(spec_base_path, logstring)),
    'webshell': os.path.realpath(os.path.join(spec_base_path, webshellstring)),
    'difffile': os.path.realpath(os.path.join(spec_base_path, difffile)),
}

def isListLike(value):
    return isinstance(value, (list, tuple, set))

def getUnicode(value, encoding=None, noneToNull=False):
    if noneToNull and value is None:
        return None
    if isListLike(value):
        value = [getUnicode(_, encoding, noneToNull) for _ in value]
        return value
    if isinstance(value, str):
        return value
    elif isinstance(value, bytes):
        while True:
            try:
                return value.decode(encoding or UNICODE_ENCODING)
            except UnicodeDecodeError as ex:
                try:
                    return value.decode(UNICODE_ENCODING)
                except:
                    value = value[:ex.start] + "".join(INVALID_UNICODE_CHAR_FORMAT % ord(_) for _ in value[ex.start:ex.end]) + value[ex.end:]
    else:
        try:
            return str(value)
        except UnicodeDecodeError:
            return str(value).encode(errors="ignore").decode()

def mkdir_p(path):
    import errno
    try:
        os.makedirs(path)
    except OSError as exc:
        if exc.errno == errno.EEXIST and os.path.isdir(path):
            pass
        else:
            raise

def getfilelist(cwd):
    filelist = []
    for root, subdirs, files in os.walk(cwd):
        for filepath in files:
            originalfile = os.path.join(root, filepath)
            if Special_path_str not in originalfile:
                filelist.append(originalfile)
    return filelist

def calcMD5(filepath):
    try:
        with open(filepath, 'rb') as f:
            md5obj = hashlib.md5()
            md5obj.update(f.read())
            hash = md5obj.hexdigest()
            return hash
    except Exception as e:
        print(f'[!] getmd5_error : {getUnicode(filepath)}')
        print(getUnicode(e))
        try:
            ORIGIN_FILE_LIST.remove(filepath)
            FILE_MD5_DICT.pop(filepath, None)
        except KeyError as e:
            pass

def getfilemd5dict(filelist=[]):
    filemd5dict = {}
    for ori_file in filelist:
        if Special_path_str not in ori_file:
            md5 = calcMD5(os.path.realpath(ori_file))
            if md5:
                filemd5dict[ori_file] = md5
    return filemd5dict

def backup_file(filelist=[]):
    for filepath in filelist:
        if Special_path_str not in filepath:
            shutil.copy2(filepath, Special_path['bak'])

if __name__ == '__main__':
    print(u'---------start------------')
    for value in Special_path:
        mkdir_p(Special_path[value])
    
    # 获取所有文件路径，并获取所有文件的MD5，同时备份所有文件
    ORIGIN_FILE_LIST = getfilelist(CWD)
    FILE_MD5_DICT = getfilemd5dict(ORIGIN_FILE_LIST)
    backup_file(ORIGIN_FILE_LIST)
    # TODO 备份文件可能会产生重名BUG
    print(u'[*] pre work end!')
    
    while True:
        file_list = getfilelist(CWD)
        # 移除新上传文件
        diff_file_list = list(set(file_list) ^ set(ORIGIN_FILE_LIST))
        if len(diff_file_list) != 0:
            for filepath in diff_file_list:
                try:
                    f = open(filepath, 'r').read()
                except Exception as e:
                    break
                if Special_string not in f:
                    try:
                        print(f'[*] webshell find : {getUnicode(filepath)}')
                        shutil.move(filepath, os.path.join(Special_path['webshell'], ntpath.basename(filepath) + '.txt'))
                    except Exception as e:
                        print(f'[!] move webshell error, "{getUnicode(filepath)}" maybe is webshell.')
                    try:
                        with open(os.path.join(Special_path['log'], 'log.txt'), 'a') as f:
                            f.write(f'newfile: {getUnicode(filepath)} : {time.ctime()}\n')
                    except Exception as e:
                        print(f'[-] log error : file move error: {getUnicode(e)}')
        
        # 防止任意文件被修改, 还原被修改文件
        md5_dict = getfilemd5dict(ORIGIN_FILE_LIST)
        for filekey in md5_dict:
            if md5_dict[filekey] != FILE_MD5_DICT.get(filekey):
                try:
                    f = open(filekey, 'r').read()
                except Exception as e:
                    break
                if Special_string not in f:
                    try:
                        print(f'[*] file had be change : {getUnicode(filekey)}')
                        shutil.move(filekey, os.path.join(Special_path['difffile'], ntpath.basename(filekey) + '.txt'))
                        shutil.move(os.path.join(Special_path['bak'], ntpath.basename(filekey)), filekey)
                    except Exception as e:
                        print(f'[!] move webshell error, "{getUnicode(filekey)}" maybe is webshell.')
                    try:
                        with open(os.path.join(Special_path['log'], 'log.txt'), 'a') as f:
                            f.write(f'diff_file: {getUnicode(filekey)} : {time.ctime()}\n')
                    except Exception as e:
                        print(f'[-] log error : done_diff: {getUnicode(filekey)}')
        time.sleep(2)
        # print('[*] ' + getUnicode(time.ctime()))

### 主要改动点：
1. **字符串编码**：将 `unicode` 和 `basestring` 替换为 `str` 和 `bytes`。
2. **异常处理**：将 `except Exception, e` 改为 `except Exception as e`。
3. **文件操作**：使用 `with open(...)` 来打开文件，以确保文件正确关闭。
4. **打印语句**：将 `print u'...'` 改为 `print(f'...')`。
5. **其他小改动**：如 `NULL` 改为 `None`，`list(getUnicode(...))` 改为列表推导式等。

希望这些改动能帮助你顺利运行Python 3版本的代码。如果有任何问题，请随时告诉我！