Write some Software

I need a neural net model to calculate multiple models on a list of customers using a loop. The first version of the code brings data from mysql, transforms it, creates training and testing datasets, trains the model, calculates predictions and writes back prediction results in a table in mysql. The second version needs to do the same but using a loop to process models for multiple customers on a list. I just need help with a loop that is efficient and brings results for each model for each customer. Files and codes to start with will be provided.