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
)

# -*- coding=utf-8
import os
import logging
import sys
import json
import os

from qcloud_cos import CosConfig, CosServiceError
from qcloud_cos import CosS3Client
from qcloud_cos.cos_threadpool import SimpleThreadPool

# 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)  # Obtain the object to configure
client = CosS3Client(config)

# Bucket information
test_bucket = 'examplebucket-1250000000'
start_prefix = 'data/'
# COS uses slashes (/) to indicate folders.
# The delimiter parameter is left empty by default, which lists all subdirectories under the directories to achieve the recursive effect of a local folder.
# If the delimiter parameter is set to "/", you need to handle subdirectories recursively in the SDK.
delimiter = ''


# List and return information about all subdirectories under the current directory.
def listCurrentDir(prefix):
    file_infos = []
    sub_dirs = []
    marker = ""
    count = 1
    while True:
        response = client.list_objects(test_bucket, prefix, delimiter, marker)
        # Debug the output.
        # json_object = json.dumps(response, indent=4)
        # print(count, " =======================================")
        # print(json_object)
        count += 1

        if "CommonPrefixes" in response:
            common_prefixes = response.get("CommonPrefixes")
            sub_dirs.extend(common_prefixes)

        if "Contents" in response:
            contents = response.get("Contents")
            file_infos.extend(contents)

        if "NextMarker" in response.keys():
            marker = response["NextMarker"]
        else:
            break

    print("=======================================================")

    # If the delimiter parameter is set to "/", you need to handle subdirectories recursively.
    # sorted(sub_dirs, key=lambda sub_dir: sub_dir["Prefix"])
    # for sub_dir in sub_dirs:
    #     print(sub_dir)
    #     sub_dir_files = listCurrentDir(sub_dir["Prefix"])
    #     file_infos.extend(sub_dir_files)

    print("=======================================================")

    sorted(file_infos, key=lambda file_info: file_info["Key"])
    for file in file_infos:
        print(file)
    return file_infos


# Download files to a local directory. Local files with the same name (if any) will be overwritten.
# If the directory structure does not exist, a directory structure will be created according to that in COS.
def downLoadFiles(file_infos):
    localDir = "./download/"

    pool = SimpleThreadPool()
    for file in file_infos:
        # Download files to local.
        file_cos_key = file["Key"]
        localName = localDir + file_cos_key

        # If the local directory does not exist, create it recursively.
        if not os.path.exists(os.path.dirname(localName)):
            os.makedirs(os.path.dirname(localName))

        # skip dir, no need to download it
        if str(localName).endswith("/"):
            continue

        # Download files
        # Use a thread pool.
        pool.add_task(client.download_file, test_bucket, file_cos_key, localName)

        # Download in whole
        # response = client.get_object(
        #     Bucket=test_bucket,
        #     Key=file_cos_key,
        # )
        # response['Body'].get_stream_to_file(localName)

    pool.wait_completion()
    return None


# Encapsulate the feature. Download a COS directory to local.
def downLoadDirFromCos(prefix):
    global file_infos

    try:
        file_infos = listCurrentDir(prefix)

    except CosServiceError as e:
        print(e.get_origin_msg())
        print(e.get_digest_msg())
        print(e.get_status_code())
        print(e.get_error_code())
        print(e.get_error_msg())
        print(e.get_resource_location())
        print(e.get_trace_id())
        print(e.get_request_id())

    downLoadFiles(file_infos)
    return None


if __name__ == "__main__":
    downLoadDirFromCos(start_prefix)

 get_object(Bucket, Key, **kwargs)

# -*- coding=utf-8
from qcloud_cos import CosConfig
from qcloud_cos import CosS3Client
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)

response = client.get_object(
    Bucket='examplebucket-1250000000',
    Key='exampleobject'
)
response['Body'].get_stream_to_file('exampleobject')

# -*- coding=utf-8
from qcloud_cos import CosConfig
from qcloud_cos import CosS3Client
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, see 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)

response = client.get_object(
    Bucket='examplebucket-1250000000',
    Key='exampleobject',
    Range='bytes=0-100'
)
response['Body'].get_stream_to_file('exampleobject')

response = client.get_object(
    Bucket='examplebucket-1250000000',
    Key='exampleobject',
    Range='string',
    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',
    TrafficLimit='819200'
)

{
    'Body': StreamBody(),
    'ETag': '"9a4802d5c99dafe1c04da0a8e7e166bf"',
    'Last-Modified': 'Wed, 28 Oct 2014 20:30:00 GMT',
    'Accept-Ranges': 'bytes',
    'Content-Range': 'bytes 0-16086/16087',
    'Cache-Control': 'max-age=1000000',
    'Content-Type': 'application/octet-stream',
    'Content-Disposition': 'attachment; filename="filename.jpg"',
    'Content-Encoding': 'gzip',
    'Content-Language': 'zh-cn',
    'Content-Length': '16807',
    'Expires': 'Wed, 28 Oct 2019 20:30:00 GMT',
    'x-cos-meta-test': 'test',
    'x-cos-version-id': 'MTg0NDUxODMzMTMwMDM2Njc1ODA',
    'x-cos-request-id': 'NTg3NzQ3ZmVfYmRjMzVfMzE5N182NzczMQ=='
}