Question

我目前创建了一个类（子类化线程）我打算用来从url下载文件。我也在使用请求，如果这有所作为。这一切都很好，但我想添加一些功能，但不知道正确的方法。

我会下载的文件很多次（定期）下载以获取最新版本。所以在这种情况下我想：

使用临时文件名下载文件。
当我确定已完成文件的完整下载时，覆盖预先存在的文件。
删除临时文件。

感谢。

修改：添加了我到目前为止的代码......

import requests
import threading

class FileDownload(threading.Thread):
    def __init__(self, url, save_as_name=None, chunk_size=1024):

        # Call the constructor from the inherited class
        threading.Thread.__init__(self)

        # Class attributes
        self.url = url
        self.save_as_name = save_as_name
        self.chunk_size = chunk_size
        self.file_size = 0
        self.bytes_received = 0
        self.stop_download = False


    def run(self):
        self._download()


    def _download(self):
        # If no file save_as_name is provided, use the name of the file
        # from the url
        if self.save_as_name == None:
            self.save_as_name = self.url.split('/')[-1]    
        # Create a Response object
        response = requests.get(self.url, stream=True, timeout=10)
        # Get the size of the file to be downloaded in bytes
        self.file_size = int(response.headers.get('content-length'))

        with open(self.save_as_name, 'wb') as file:
            # Write downloaded file contents per iteration
            for chunk in response.iter_content(chunk_size=self.chunk_size):
                # Mechanism to stop download and therefore its thread
                if self.stop_download == False:
                    file.write(chunk)
                    # Keep track of the total bytes recieved per iteration
                    self.bytes_received = self.bytes_received + len(chunk)
                else:
                    break

下载文件并覆盖任何具有相同名称的预先存在的文件 - Python 3

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