tencent cloud

download_file(Bucket, Key, DestFilePath, PartSize=20, MAXThread=5, EnableCRC=False, **Kwargs)

# -*- coding=utf-8
from qcloud_cos import CosConfig
from qcloud_cos import CosS3Client
from qcloud_cos.cos_exception import CosClientError, CosServiceError
import sys
import os
import logging

# In most cases, set the log level to INFO. If you need to debug, you can set it to DEBUG and the SDK will print information about the communication with the server.
logging.basicConfig(level=logging.INFO, stream=sys.stdout)

# 1. Set user attributes such as secret_id, secret_key, and region. Appid has been removed from CosConfig and thus needs to be specified in Bucket, which is formatted as BucketName-Appid.
secret_id = os.environ['COS_SECRET_ID']     #  User `SecretId`. We recommend you use a sub-account key and follow the principle of least privilege to reduce risks. For information about how to obtain a sub-account key, visit https://www.tencentcloud.com/document/product/598/32675.
secret_key = os.environ['COS_SECRET_KEY']   # User `SecretKey`. We recommend you use a sub-account key and follow the principle of least privilege to reduce risks. For information about how to obtain a sub-account key, visit https://www.tencentcloud.com/document/product/598/32675.
region = 'ap-beijing'      # Replace it with the actual region, which can be viewed in the console at https://console.tencentcloud.com/cos5/bucket.
                           # For the list of regions supported by COS, visit https://www.tencentcloud.com/document/product/436/6224.
token = None               # Token is required for temporary keys but not permanent keys. For more information about how to generate and use a temporary key, visit https://www.tencentcloud.com/document/product/436/14048.
scheme = 'https'           # Specify whether to use HTTP or HTTPS protocol to access COS. This field is optional and is `https` by default.

config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key, Token=token, Scheme=scheme)
client = CosS3Client(config)

# Use the advanced API to download once without retry. In this case, the checkpoint restart feature is not used.
response = client.download_file(
    Bucket='examplebucket-1250000000',
    Key='exampleobject',
    DestFilePath='local.txt'
)

# Use the advanced API for checkpoint restart, and the successfully uploaded parts will not be downloaded again during retries (10 retries here).
for i in range(0, 10):
    try:
        response = client.download_file(
            Bucket='examplebucket-1250000000',
            Key='exampleobject',
            DestFilePath='local.txt')
        break
    except CosClientError or CosServiceError as e:
        print(e)

def upload_percentage(consumed_bytes, total_bytes):
    """Callback function that calculates the upload progress (in percentage)

    :param consumed_bytes: uploaded data amount
    :param total_bytes: total data amount
    """
    if total_bytes:
        rate = int(100 * (float(consumed_bytes) / float(total_bytes)))
        print('\\r{0}% '.format(rate))
        sys.stdout.flush()

response = client.download_file(
    Bucket='examplebucket-1250000000',
    Key='exampleobject',
    DestFilePath='local.txt',
    PartSize=1,
    MAXThread=5,
    EnableCRC=True,
    TrafficLimit='1048576'
    IfMatch='"9a4802d5c99dafe1c04da0a8e7e166bf"',
    IfModifiedSince='Wed, 28 Oct 2014 20:30:00 GMT',
    IfNoneMatch='"9a4802d5c99dafe1c04da0a8e7e166bf"',
    IfUnmodifiedSince='Wed, 28 Oct 2014 20:30:00 GMT',
    ResponseCacheControl='string',
    ResponseContentDisposition='string',
    ResponseContentEncoding='string',
    ResponseContentLanguage='string',
    ResponseContentType='string',
    ResponseExpires='string',
    VersionId='string',
    progress_callback=upload_percentage
)