Alex C Alex C - 1 month ago 25
Python Question

PyCharm intellisense for boto3

having problems seeing full intellisense (code completion) options in PyCharm.
working with python 3.4 on Windows.
the suggests are partially working:

import boto3
s = boto3.Session() (boto3. will bring up list of methods/params of object boto3)
ec2 = s.resource('ec2') (resource is a suggested method!)
ec2. <<<< this brings up nothing. For some reason PyCharm cant detect that ec2 object would have


while I can work off documentation alone, intellisense is just such a nice feature to have!

ive had similar problems getting it to complete lxml syntax but I thought that was because I had to install lxml directly as a binary (too many hoops to jump through on windows to install it via pip)

Anyone else encounter similar problems?

While we are here,
I see a lot of different libraries around using awscli with python: boto, boto3, troposphere etc. What are some advantages of using one over the other. Amazon states that boto3 is the prefered method over boto but for my usage of starting/stopping ec2 instances could be easily done with older boto.

Answer

This is happening because all of the methods on the boto3 clients and resource objects are generated at runtime based on a JSON file that describes what operations the service supports. Pycharm would have to have specific knowledge about this process in order to auto complete method names.

For your second question, boto3 is the official AWS SDK for Python. One of the main advantages of boto3 is that because of this JSON model driven process that describes the AWS APIs, most new service features only require a simple model update. This means API updates happen in a quick, consistent, and reliable manner.

But if you're using boto in existing code and it's working for you, feel free to keep using it. You can always install boto3 along side boto if you need to pull in new functionality.