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参考资料 ultralytics/utils/downloads.py

备注

该文件可从https://github.com/ultralytics/ultralytics/blob/main/ ultralytics/utils/downloads .py 获取。如果您发现问题,请通过提交 Pull Request🛠️ 帮助修复。谢谢🙏!



ultralytics.utils.downloads.is_url(url, check=True)

验证给定字符串是否为 URL,并检查该 URL 是否在线存在。

参数

名称 类型 说明 默认值
url str

要验证为 URL 的字符串。

所需
check bool

如果为 True,则执行额外检查,查看 URL 是否在线存在。 默认为 True。

True

返回:

类型 说明
bool

如果字符串是有效的 URL,则返回 True。如果 "check "为 True,则如果 URL 在线存在,也会返回 True。 否则返回 False。

示例
valid = is_url("https://www.example.com")
源代码 ultralytics/utils/downloads.py
def is_url(url, check=True):
    """
    Validates if the given string is a URL and optionally checks if the URL exists online.

    Args:
        url (str): The string to be validated as a URL.
        check (bool, optional): If True, performs an additional check to see if the URL exists online.
            Defaults to True.

    Returns:
        (bool): Returns True if the string is a valid URL. If 'check' is True, also returns True if the URL exists online.
            Returns False otherwise.

    Example:
        ```python
        valid = is_url("https://www.example.com")
        ```
    """
    with contextlib.suppress(Exception):
        url = str(url)
        result = parse.urlparse(url)
        assert all([result.scheme, result.netloc])  # check if is url
        if check:
            with request.urlopen(url) as response:
                return response.getcode() == 200  # check if exists online
        return True
    return False



ultralytics.utils.downloads.delete_dsstore(path, files_to_delete=('.DS_Store', '__MACOSX'))

删除指定目录下的所有".DS_store "文件。

参数

名称 类型 说明 默认值
path str

应删除".DS_store "文件的目录路径。

所需
files_to_delete tuple

要删除的文件。

('.DS_Store', '__MACOSX')
示例
from ultralytics.utils.downloads import delete_dsstore

delete_dsstore('path/to/dir')
备注

".DS_store "文件由苹果操作系统创建,包含文件夹和文件的元数据。它们 是隐藏的系统文件,在不同操作系统之间传输文件时可能会出现问题。

源代码 ultralytics/utils/downloads.py
def delete_dsstore(path, files_to_delete=(".DS_Store", "__MACOSX")):
    """
    Deletes all ".DS_store" files under a specified directory.

    Args:
        path (str, optional): The directory path where the ".DS_store" files should be deleted.
        files_to_delete (tuple): The files to be deleted.

    Example:
        ```python
        from ultralytics.utils.downloads import delete_dsstore

        delete_dsstore('path/to/dir')
        ```

    Note:
        ".DS_store" files are created by the Apple operating system and contain metadata about folders and files. They
        are hidden system files and can cause issues when transferring files between different operating systems.
    """
    for file in files_to_delete:
        matches = list(Path(path).rglob(file))
        LOGGER.info(f"Deleting {file} files: {matches}")
        for f in matches:
            f.unlink()



ultralytics.utils.downloads.zip_directory(directory, compress=True, exclude=('.DS_Store', '__MACOSX'), progress=True)

对目录内容进行压缩,排除包含排除列表中字符串的文件。生成的压缩文件 命名,并放置在目录旁边。

参数

名称 类型 说明 默认值
directory str | Path

要压缩的目录的路径。

所需
compress bool

压缩时是否压缩文件。默认为 True。

True
exclude tuple

要排除的文件名字符串的元组。默认为('.DS_Store', '__MACOSX')。

('.DS_Store', '__MACOSX')
progress bool

是否显示进度条。默认为 True。

True

返回:

类型 说明
Path

生成的 zip 文件的路径。

示例
from ultralytics.utils.downloads import zip_directory

file = zip_directory('path/to/dir')
源代码 ultralytics/utils/downloads.py
def zip_directory(directory, compress=True, exclude=(".DS_Store", "__MACOSX"), progress=True):
    """
    Zips the contents of a directory, excluding files containing strings in the exclude list. The resulting zip file is
    named after the directory and placed alongside it.

    Args:
        directory (str | Path): The path to the directory to be zipped.
        compress (bool): Whether to compress the files while zipping. Default is True.
        exclude (tuple, optional): A tuple of filename strings to be excluded. Defaults to ('.DS_Store', '__MACOSX').
        progress (bool, optional): Whether to display a progress bar. Defaults to True.

    Returns:
        (Path): The path to the resulting zip file.

    Example:
        ```python
        from ultralytics.utils.downloads import zip_directory

        file = zip_directory('path/to/dir')
        ```
    """
    from zipfile import ZIP_DEFLATED, ZIP_STORED, ZipFile

    delete_dsstore(directory)
    directory = Path(directory)
    if not directory.is_dir():
        raise FileNotFoundError(f"Directory '{directory}' does not exist.")

    # Unzip with progress bar
    files_to_zip = [f for f in directory.rglob("*") if f.is_file() and all(x not in f.name for x in exclude)]
    zip_file = directory.with_suffix(".zip")
    compression = ZIP_DEFLATED if compress else ZIP_STORED
    with ZipFile(zip_file, "w", compression) as f:
        for file in TQDM(files_to_zip, desc=f"Zipping {directory} to {zip_file}...", unit="file", disable=not progress):
            f.write(file, file.relative_to(directory))

    return zip_file  # return path to zip file



ultralytics.utils.downloads.unzip_file(file, path=None, exclude=('.DS_Store', '__MACOSX'), exist_ok=False, progress=True)

解压 *.zip 文件到指定路径,排除包含排除列表中字符串的文件。

如果 zip 文件不包含单个顶级目录,函数将创建一个与 zip 文件同名(不含扩展名)的新 目录来提取其内容。 如果未提供路径,函数将使用 zip 文件的父目录作为默认路径。

参数

名称 类型 说明 默认值
file str

要解压缩的 zip 文件的路径。

所需
path str

解压压缩文件的路径。默认为 "无"。

None
exclude tuple

要排除的文件名字符串的元组。默认为('.DS_Store', '__MACOSX')。

('.DS_Store', '__MACOSX')
exist_ok bool

是否覆盖现有内容(如果存在)。默认为 "假"。

False
progress bool

是否显示进度条。默认为 True。

True

加薪:

类型 说明
BadZipFile

如果提供的文件不存在或不是有效的 zip 文件。

返回:

类型 说明
Path

解压缩文件所在目录的路径。

示例
from ultralytics.utils.downloads import unzip_file

dir = unzip_file('path/to/file.zip')
源代码 ultralytics/utils/downloads.py
def unzip_file(file, path=None, exclude=(".DS_Store", "__MACOSX"), exist_ok=False, progress=True):
    """
    Unzips a *.zip file to the specified path, excluding files containing strings in the exclude list.

    If the zipfile does not contain a single top-level directory, the function will create a new
    directory with the same name as the zipfile (without the extension) to extract its contents.
    If a path is not provided, the function will use the parent directory of the zipfile as the default path.

    Args:
        file (str): The path to the zipfile to be extracted.
        path (str, optional): The path to extract the zipfile to. Defaults to None.
        exclude (tuple, optional): A tuple of filename strings to be excluded. Defaults to ('.DS_Store', '__MACOSX').
        exist_ok (bool, optional): Whether to overwrite existing contents if they exist. Defaults to False.
        progress (bool, optional): Whether to display a progress bar. Defaults to True.

    Raises:
        BadZipFile: If the provided file does not exist or is not a valid zipfile.

    Returns:
        (Path): The path to the directory where the zipfile was extracted.

    Example:
        ```python
        from ultralytics.utils.downloads import unzip_file

        dir = unzip_file('path/to/file.zip')
        ```
    """
    from zipfile import BadZipFile, ZipFile, is_zipfile

    if not (Path(file).exists() and is_zipfile(file)):
        raise BadZipFile(f"File '{file}' does not exist or is a bad zip file.")
    if path is None:
        path = Path(file).parent  # default path

    # Unzip the file contents
    with ZipFile(file) as zipObj:
        files = [f for f in zipObj.namelist() if all(x not in f for x in exclude)]
        top_level_dirs = {Path(f).parts[0] for f in files}

        if len(top_level_dirs) > 1 or (len(files) > 1 and not files[0].endswith("/")):
            # Zip has multiple files at top level
            path = extract_path = Path(path) / Path(file).stem  # i.e. ../datasets/coco8
        else:
            # Zip has 1 top-level directory
            extract_path = path  # i.e. ../datasets
            path = Path(path) / list(top_level_dirs)[0]  # i.e. ../datasets/coco8

        # Check if destination directory already exists and contains files
        if path.exists() and any(path.iterdir()) and not exist_ok:
            # If it exists and is not empty, return the path without unzipping
            LOGGER.warning(f"WARNING ⚠️ Skipping {file} unzip as destination directory {path} is not empty.")
            return path

        for f in TQDM(files, desc=f"Unzipping {file} to {Path(path).resolve()}...", unit="file", disable=not progress):
            # Ensure the file is within the extract_path to avoid path traversal security vulnerability
            if ".." in Path(f).parts:
                LOGGER.warning(f"Potentially insecure file path: {f}, skipping extraction.")
                continue
            zipObj.extract(f, extract_path)

    return path  # return unzip dir



ultralytics.utils.downloads.check_disk_space(url='https://ultralytics.com/assets/coco128.zip', sf=1.5, hard=True)

检查是否有足够的磁盘空间下载和存储文件。

参数

名称 类型 说明 默认值
url str

文件的 URL。默认为'https://ultralytics.com/assets/coco128.zip '。

'https://ultralytics.com/assets/coco128.zip'
sf float

安全系数,所需自由空间的乘数。默认为 2.0。

1.5
hard bool

是否在磁盘空间不足时出错。默认为 True。

True

返回:

类型 说明
bool

如果磁盘空间足够,则为 True,否则为 False。

源代码 ultralytics/utils/downloads.py
def check_disk_space(url="https://ultralytics.com/assets/coco128.zip", sf=1.5, hard=True):
    """
    Check if there is sufficient disk space to download and store a file.

    Args:
        url (str, optional): The URL to the file. Defaults to 'https://ultralytics.com/assets/coco128.zip'.
        sf (float, optional): Safety factor, the multiplier for the required free space. Defaults to 2.0.
        hard (bool, optional): Whether to throw an error or not on insufficient disk space. Defaults to True.

    Returns:
        (bool): True if there is sufficient disk space, False otherwise.
    """
    try:
        r = requests.head(url)  # response
        assert r.status_code < 400, f"URL error for {url}: {r.status_code} {r.reason}"  # check response
    except Exception:
        return True  # requests issue, default to True

    # Check file size
    gib = 1 << 30  # bytes per GiB
    data = int(r.headers.get("Content-Length", 0)) / gib  # file size (GB)
    total, used, free = (x / gib for x in shutil.disk_usage(Path.cwd()))  # bytes

    if data * sf < free:
        return True  # sufficient space

    # Insufficient space
    text = (
        f"WARNING ⚠️ Insufficient free disk space {free:.1f} GB < {data * sf:.3f} GB required, "
        f"Please free {data * sf - free:.1f} GB additional disk space and try again."
    )
    if hard:
        raise MemoryError(text)
    LOGGER.warning(text)
    return False



ultralytics.utils.downloads.get_google_drive_file_info(link)

读取可共享 Google Drive 文件链接的直接下载链接和文件名。

参数

名称 类型 说明 默认值
link str

Google Drive 文件的可共享链接。

所需

返回:

类型 说明
str

Google Drive 文件的直接下载 URL。

str

Google Drive 文件的原始文件名。如果文件名提取失败,则返回 "无"。

示例
from ultralytics.utils.downloads import get_google_drive_file_info

link = "https://drive.google.com/file/d/1cqT-cJgANNrhIHCrEufUYhQ4RqiWG_lJ/view?usp=drive_link"
url, filename = get_google_drive_file_info(link)
源代码 ultralytics/utils/downloads.py
def get_google_drive_file_info(link):
    """
    Retrieves the direct download link and filename for a shareable Google Drive file link.

    Args:
        link (str): The shareable link of the Google Drive file.

    Returns:
        (str): Direct download URL for the Google Drive file.
        (str): Original filename of the Google Drive file. If filename extraction fails, returns None.

    Example:
        ```python
        from ultralytics.utils.downloads import get_google_drive_file_info

        link = "https://drive.google.com/file/d/1cqT-cJgANNrhIHCrEufUYhQ4RqiWG_lJ/view?usp=drive_link"
        url, filename = get_google_drive_file_info(link)
        ```
    """
    file_id = link.split("/d/")[1].split("/view")[0]
    drive_url = f"https://drive.google.com/uc?export=download&id={file_id}"
    filename = None

    # Start session
    with requests.Session() as session:
        response = session.get(drive_url, stream=True)
        if "quota exceeded" in str(response.content.lower()):
            raise ConnectionError(
                emojis(
                    f"❌  Google Drive file download quota exceeded. "
                    f"Please try again later or download this file manually at {link}."
                )
            )
        for k, v in response.cookies.items():
            if k.startswith("download_warning"):
                drive_url += f"&confirm={v}"  # v is token
        cd = response.headers.get("content-disposition")
        if cd:
            filename = re.findall('filename="(.+)"', cd)[0]
    return drive_url, filename



ultralytics.utils.downloads.safe_download(url, file=None, dir=None, unzip=True, delete=False, curl=False, retry=3, min_bytes=1.0, exist_ok=False, progress=True)

从 URL 下载文件,并提供重试、解压缩和删除下载文件的选项。

参数

名称 类型 说明 默认值
url str

要下载文件的 URL。

所需
file str

下载文件的文件名。 如果不提供,文件将以与 URL 相同的名称保存。

None
dir str

保存下载文件的目录。 如果未提供,文件将保存在当前工作目录下。

None
unzip bool

是否解压缩下载的文件。默认值:真。

True
delete bool

是否在解压缩后删除下载的文件。默认值:假。

False
curl bool

是否使用 curl 命令行工具进行下载。默认为假

False
retry int

下载失败时重试的次数。默认值:3。

3
min_bytes float

下载文件的最小字节数。 下载成功。默认值:1E0。

1.0
exist_ok bool

是否在解压缩过程中覆盖现有内容。默认为 "假"。

False
progress bool

是否在下载过程中显示进度条。默认值:真。

True
示例
from ultralytics.utils.downloads import safe_download

link = "https://ultralytics.com/assets/bus.jpg"
path = safe_download(link)
源代码 ultralytics/utils/downloads.py
def safe_download(
    url,
    file=None,
    dir=None,
    unzip=True,
    delete=False,
    curl=False,
    retry=3,
    min_bytes=1e0,
    exist_ok=False,
    progress=True,
):
    """
    Downloads files from a URL, with options for retrying, unzipping, and deleting the downloaded file.

    Args:
        url (str): The URL of the file to be downloaded.
        file (str, optional): The filename of the downloaded file.
            If not provided, the file will be saved with the same name as the URL.
        dir (str, optional): The directory to save the downloaded file.
            If not provided, the file will be saved in the current working directory.
        unzip (bool, optional): Whether to unzip the downloaded file. Default: True.
        delete (bool, optional): Whether to delete the downloaded file after unzipping. Default: False.
        curl (bool, optional): Whether to use curl command line tool for downloading. Default: False.
        retry (int, optional): The number of times to retry the download in case of failure. Default: 3.
        min_bytes (float, optional): The minimum number of bytes that the downloaded file should have, to be considered
            a successful download. Default: 1E0.
        exist_ok (bool, optional): Whether to overwrite existing contents during unzipping. Defaults to False.
        progress (bool, optional): Whether to display a progress bar during the download. Default: True.

    Example:
        ```python
        from ultralytics.utils.downloads import safe_download

        link = "https://ultralytics.com/assets/bus.jpg"
        path = safe_download(link)
        ```
    """
    gdrive = url.startswith("https://drive.google.com/")  # check if the URL is a Google Drive link
    if gdrive:
        url, file = get_google_drive_file_info(url)

    f = Path(dir or ".") / (file or url2file(url))  # URL converted to filename
    if "://" not in str(url) and Path(url).is_file():  # URL exists ('://' check required in Windows Python<3.10)
        f = Path(url)  # filename
    elif not f.is_file():  # URL and file do not exist
        desc = f"Downloading {url if gdrive else clean_url(url)} to '{f}'"
        LOGGER.info(f"{desc}...")
        f.parent.mkdir(parents=True, exist_ok=True)  # make directory if missing
        check_disk_space(url)
        for i in range(retry + 1):
            try:
                if curl or i > 0:  # curl download with retry, continue
                    s = "sS" * (not progress)  # silent
                    r = subprocess.run(["curl", "-#", f"-{s}L", url, "-o", f, "--retry", "3", "-C", "-"]).returncode
                    assert r == 0, f"Curl return value {r}"
                else:  # urllib download
                    method = "torch"
                    if method == "torch":
                        torch.hub.download_url_to_file(url, f, progress=progress)
                    else:
                        with request.urlopen(url) as response, TQDM(
                            total=int(response.getheader("Content-Length", 0)),
                            desc=desc,
                            disable=not progress,
                            unit="B",
                            unit_scale=True,
                            unit_divisor=1024,
                        ) as pbar:
                            with open(f, "wb") as f_opened:
                                for data in response:
                                    f_opened.write(data)
                                    pbar.update(len(data))

                if f.exists():
                    if f.stat().st_size > min_bytes:
                        break  # success
                    f.unlink()  # remove partial downloads
            except Exception as e:
                if i == 0 and not is_online():
                    raise ConnectionError(emojis(f"❌  Download failure for {url}. Environment is not online.")) from e
                elif i >= retry:
                    raise ConnectionError(emojis(f"❌  Download failure for {url}. Retry limit reached.")) from e
                LOGGER.warning(f"⚠️ Download failure, retrying {i + 1}/{retry} {url}...")

    if unzip and f.exists() and f.suffix in ("", ".zip", ".tar", ".gz"):
        from zipfile import is_zipfile

        unzip_dir = (dir or f.parent).resolve()  # unzip to dir if provided else unzip in place
        if is_zipfile(f):
            unzip_dir = unzip_file(file=f, path=unzip_dir, exist_ok=exist_ok, progress=progress)  # unzip
        elif f.suffix in (".tar", ".gz"):
            LOGGER.info(f"Unzipping {f} to {unzip_dir}...")
            subprocess.run(["tar", "xf" if f.suffix == ".tar" else "xfz", f, "--directory", unzip_dir], check=True)
        if delete:
            f.unlink()  # remove zip
        return unzip_dir



ultralytics.utils.downloads.get_github_assets(repo='ultralytics/assets', version='latest', retry=False)

从 GitHub 仓库读取指定版本的标签和资产。如果未指定版本,则 函数会获取最新发布的资产。

参数

名称 类型 说明 默认值
repo str

格式为 "owner/repo "的 GitHub 仓库。默认为 "ultralytics/assets"。

'ultralytics/assets'
version str

获取资产的版本。默认为 "最新"。

'latest'
retry bool

在请求失败时重试请求的标志。默认为 "假"。

False

返回:

类型 说明
tuple

包含发布标记和资产名称列表的元组。

示例
tag, assets = get_github_assets(repo='ultralytics/assets', version='latest')
源代码 ultralytics/utils/downloads.py
def get_github_assets(repo="ultralytics/assets", version="latest", retry=False):
    """
    Retrieve the specified version's tag and assets from a GitHub repository. If the version is not specified, the
    function fetches the latest release assets.

    Args:
        repo (str, optional): The GitHub repository in the format 'owner/repo'. Defaults to 'ultralytics/assets'.
        version (str, optional): The release version to fetch assets from. Defaults to 'latest'.
        retry (bool, optional): Flag to retry the request in case of a failure. Defaults to False.

    Returns:
        (tuple): A tuple containing the release tag and a list of asset names.

    Example:
        ```python
        tag, assets = get_github_assets(repo='ultralytics/assets', version='latest')
        ```
    """

    if version != "latest":
        version = f"tags/{version}"  # i.e. tags/v6.2
    url = f"https://api.github.com/repos/{repo}/releases/{version}"
    r = requests.get(url)  # github api
    if r.status_code != 200 and r.reason != "rate limit exceeded" and retry:  # failed and not 403 rate limit exceeded
        r = requests.get(url)  # try again
    if r.status_code != 200:
        LOGGER.warning(f"⚠️ GitHub assets check failure for {url}: {r.status_code} {r.reason}")
        return "", []
    data = r.json()
    return data["tag_name"], [x["name"] for x in data["assets"]]  # tag, assets i.e. ['yolov8n.pt', 'yolov8s.pt', ...]



ultralytics.utils.downloads.attempt_download_asset(file, repo='ultralytics/assets', release='v8.1.0', **kwargs)

如果本地找不到文件,则尝试从 GitHub 发布资产中下载该文件。该函数首先在本地检查文件 然后尝试从指定的 GitHub 版本库中下载。

参数

名称 类型 说明 默认值
file str | Path

要下载的文件名或文件路径。

所需
repo str

格式为 "owner/repo "的 GitHub 仓库。默认为 "ultralytics/assets"。

'ultralytics/assets'
release str

要下载的具体版本。默认为 "v8.1.0"。

'v8.1.0'
**kwargs dict

下载过程的附加关键字参数。

{}

返回:

类型 说明
str

下载文件的路径。

示例
file_path = attempt_download_asset('yolov5s.pt', repo='ultralytics/assets', release='latest')
源代码 ultralytics/utils/downloads.py
def attempt_download_asset(file, repo="ultralytics/assets", release="v8.1.0", **kwargs):
    """
    Attempt to download a file from GitHub release assets if it is not found locally. The function checks for the file
    locally first, then tries to download it from the specified GitHub repository release.

    Args:
        file (str | Path): The filename or file path to be downloaded.
        repo (str, optional): The GitHub repository in the format 'owner/repo'. Defaults to 'ultralytics/assets'.
        release (str, optional): The specific release version to be downloaded. Defaults to 'v8.1.0'.
        **kwargs (dict): Additional keyword arguments for the download process.

    Returns:
        (str): The path to the downloaded file.

    Example:
        ```python
        file_path = attempt_download_asset('yolov5s.pt', repo='ultralytics/assets', release='latest')
        ```
    """
    from ultralytics.utils import SETTINGS  # scoped for circular import

    # YOLOv3/5u updates
    file = str(file)
    file = checks.check_yolov5u_filename(file)
    file = Path(file.strip().replace("'", ""))
    if file.exists():
        return str(file)
    elif (SETTINGS["weights_dir"] / file).exists():
        return str(SETTINGS["weights_dir"] / file)
    else:
        # URL specified
        name = Path(parse.unquote(str(file))).name  # decode '%2F' to '/' etc.
        download_url = f"https://github.com/{repo}/releases/download"
        if str(file).startswith(("http:/", "https:/")):  # download
            url = str(file).replace(":/", "://")  # Pathlib turns :// -> :/
            file = url2file(name)  # parse authentication https://url.com/file.txt?auth...
            if Path(file).is_file():
                LOGGER.info(f"Found {clean_url(url)} locally at {file}")  # file already exists
            else:
                safe_download(url=url, file=file, min_bytes=1e5, **kwargs)

        elif repo == GITHUB_ASSETS_REPO and name in GITHUB_ASSETS_NAMES:
            safe_download(url=f"{download_url}/{release}/{name}", file=file, min_bytes=1e5, **kwargs)

        else:
            tag, assets = get_github_assets(repo, release)
            if not assets:
                tag, assets = get_github_assets(repo)  # latest release
            if name in assets:
                safe_download(url=f"{download_url}/{tag}/{name}", file=file, min_bytes=1e5, **kwargs)

        return str(file)



ultralytics.utils.downloads.download(url, dir=Path.cwd(), unzip=True, delete=False, curl=False, threads=1, retry=3, exist_ok=False)

将指定 URL 中的文件下载到指定目录。如果指定多个线程,则支持并发下载。 支持并发下载。

参数

名称 类型 说明 默认值
url str | list

要下载文件的 URL 或 URL 列表。

所需
dir Path

保存文件的目录。默认为当前工作目录。

cwd()
unzip bool

下载文件后解压缩的标志。默认为 True。

True
delete bool

提取后删除 zip 文件的标志。默认为 "假"。

False
curl bool

使用 curl 下载的标志。默认为假。

False
threads int

用于并发下载的线程数。默认为 1。

1
retry int

下载失败时的重试次数。默认为 3。

3
exist_ok bool

是否在解压缩过程中覆盖现有内容。默认为 "假"。

False
示例
download('https://ultralytics.com/assets/example.zip', dir='path/to/dir', unzip=True)
源代码 ultralytics/utils/downloads.py
def download(url, dir=Path.cwd(), unzip=True, delete=False, curl=False, threads=1, retry=3, exist_ok=False):
    """
    Downloads files from specified URLs to a given directory. Supports concurrent downloads if multiple threads are
    specified.

    Args:
        url (str | list): The URL or list of URLs of the files to be downloaded.
        dir (Path, optional): The directory where the files will be saved. Defaults to the current working directory.
        unzip (bool, optional): Flag to unzip the files after downloading. Defaults to True.
        delete (bool, optional): Flag to delete the zip files after extraction. Defaults to False.
        curl (bool, optional): Flag to use curl for downloading. Defaults to False.
        threads (int, optional): Number of threads to use for concurrent downloads. Defaults to 1.
        retry (int, optional): Number of retries in case of download failure. Defaults to 3.
        exist_ok (bool, optional): Whether to overwrite existing contents during unzipping. Defaults to False.

    Example:
        ```python
        download('https://ultralytics.com/assets/example.zip', dir='path/to/dir', unzip=True)
        ```
    """
    dir = Path(dir)
    dir.mkdir(parents=True, exist_ok=True)  # make directory
    if threads > 1:
        with ThreadPool(threads) as pool:
            pool.map(
                lambda x: safe_download(
                    url=x[0],
                    dir=x[1],
                    unzip=unzip,
                    delete=delete,
                    curl=curl,
                    retry=retry,
                    exist_ok=exist_ok,
                    progress=threads <= 1,
                ),
                zip(url, repeat(dir)),
            )
            pool.close()
            pool.join()
    else:
        for u in [url] if isinstance(url, (str, Path)) else url:
            safe_download(url=u, dir=dir, unzip=unzip, delete=delete, curl=curl, retry=retry, exist_ok=exist_ok)





创建于 2023-11-12,更新于 2023-11-25
作者:glenn-jocher(3),Laughing-q(1)