(expires_in, bucket, obj)
return presigned_url
Generate a signed URL
    :param expires_in:  URL Expiration time in seconds
    :param bucket:
    :param obj:         S3 Key name
    :return:            Signed URL
Generate a signed URL
    :param expires_in:  URL Expiration time in seconds
    :param bucket:
    :param obj:         S3 Key name
    :return:            Signed URL
Generate a signed URL : param expires_in : URL Expiration time in seconds : param bucket : : param obj : S3 Key name : return : Signed URL
def get_signed_url(expires_in, bucket, obj):
    """
    Generate a signed URL
    :param expires_in:  URL Expiration time in seconds
    :param bucket:
    :param obj:         S3 Key name
    :return:            Signed URL
    """
    s3_cli = boto3.client("s3")
    presigned_url = s3_cli.generate_presigned_url('get_object', Params={'Bucket': bucket, 'Key': obj},
                                                  ExpiresIn=expires_in)
    return presigned_url
def get_signed_url ( expires_in , bucket , obj ) : s3_cli = boto3 . client ( "s3" ) presigned_url = s3_cli . generate_presigned_url ( 'get_object' , Params = { 'Bucket' : bucket , 'Key' : obj } , ExpiresIn = expires_in ) return presigned_url