S3ResponseError: 403 Forbidden.An error occurred (NoSuchKey) when calling the GetObject operation: The specified key does not exist - amazon-s3

Question

try:
conn = boto.connect_s3(access_key,secret_access_key)
bucket = conn.get_bucket(bucket_name, validate=False)
k1 = Key(bucket)
k1.key = 'Date_Table.csv'
# k = bucket.get_key('Date_Table.csv')
k1.make_public()
k1.get_contents_to_filename(tar)
except Exception as e:
print(e)
i am getting error
S3ResponseError: 403 Forbidden
AccessDeniedAccess
DeniedD9ED8BFF6D6A993Eaw0KmxskATNBTDUEo3SZdwrNVolAnrt9/pkO/EGlq6X9Gxf36fQiBAWQA7dBSjBNZknMxWDG9GI=
i tried all posibility and still getting same error .. please guide me how to solve this issue.
i tried other way as below and getting error
An error occurred (NoSuchKey) when calling the GetObject operation:
The specified key does not exist.
session = boto3.session.Session(aws_access_key_id=access_key, aws_secret_access_key=secret_access_key,region_name='us-west-2')
print ("session:"+str(session)+"\n")
client = session.client('s3', endpoint_url=s3_url)
print ("client:"+str(client)+"\n")
stuff = client.get_object(Bucket=bucket_name, Key='Date_Table.csv')
print ("stuff:"+str(stuff)+"\n")
stuff.download_file(local_filename)
ge

Answer 1

Always use boto3. boto is deprecated.
As long as you setup AWS CLI credential, you don't need to pass the hard-coded credential. Read boto3 credential setup throughly.
There is no reason to initiate boto3.session unless you are using different region and user profile.
Take your time and study difference between service client(boto3.client) vs service resources(boto3.resources).
Low level boto3.client is easier to use for experiments. Use high level boto3.resource if you need to pass around arbitrary object.
Here is the simple code for boto3.client("s3").download_file.
import boto3
# initiate the proper AWS services client, i.e. S3
s3 = boto3.client("s3")
s3.download_file('your_bucket_name', 'Date_Table.csv', '/your/local/path/and/filename')