use Python to download reports from multiple accounts

Hi,

Written a Python code to download reports (e.g. AD_PERFORMANCE_REPORT ), am using my mcc account to get reports for a client account, now i want to get reports of many client accounts (all under the same mcc manager account).

I am new to python (and programming), so I have few questions to fill up my knowledge gaps so I can tailor the best solution. 

1)

I used this sample code: create_adwords_client_without_yaml.py (https://github.com/googleads/googleads-python-lib/blob/master/examples/adwords/authentication/create_adwords_client_without_yaml.py)

just filled all the variables with my token etc., and used the CLIENT_CUSTOMER_ID of my MCC. 

So my first question is - what exactly this code does? 

My app didn't work until I run this piece of code, but I cannot understand -is this something you need to run once? like to "register" your application? Or is it initiating some session that gets expired after a while? 

Also - I am using yaml file. It works fine but the sample says "without_yaml" so I'm obviously not using it the way i should have, but I am not sure how my yaml file is related to this sample code (some fields are obviously duplicated, but the CLIENT_CUSTOMER_ID is not the same, in the yaml i use the one of the client account, not the mcc). 

2)

So in my ymal file I field my token etc. (same as in the aforementioned sample code), but here i use the CLIENT_CUSTOMER_ID is the client account. 

So as far as I understand it, every time I want to get the report for a different client account (under the same mcc), I need to switch to a different ymal file (like if i'll hold many yaml files, one for each client account, and pass a variable with the correct file path to LoadFromStorage(MY_CLIENT_YAML_PATH) ) - is this the right way to go?

3)

Is there a way to get all the AD_PERFORMANCE_REPORT reports for all the client accounts under my mcc account?

My current solution is to write the AWQL I need, then iterate and run the query on each account one at a time (pointing to the different yaml files as described in question 2 above) - is this the way to go?

I've went through all training materials I found and couldn't quite find my answers, so I'll mighty appreciate any guidance. 

Thanks !

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