Using If statement to call a functions in Python

I am running a code to create cloudformation stack, delete stack, update stack with defined parameter variable using json file using python.

I have defined a 3 different statement under init() function. I need to put a if condition: if i want to create a stack, it will call "create_products" else, update a stack, it will call "update_products" elif, delete a stack, it will update "delete_products"

from __future__ import print_function
import subprocess
import json
import yaml
import sys
import os
import re
import boto3
from glob import glob

def createstack(productName, productId, paramlist): 
    try:
        client = boto3.client('servicecatalog', region_name='us-east-1')
        ProvisioningArtifactId = client.list_provisioning_artifacts(ProductId=productId)
        ArtifactId = ProvisioningArtifactId['ProvisioningArtifactDetails'][0]['Id']
        response = client.provision_product(ProvisionedProductName=productName, ProductId=productId, ProvisioningArtifactId=ArtifactId, ProvisioningParameters=paramlist)
        print(response)
    except Exception as e:
        error = "An error occurred processing this request: " + str(e)
        print(error) 

def updatestack(productName, productId, paramlist):    
    try:
        client = boto3.client('servicecatalog', region_name='us-east-1')
        ProvisioningArtifactId = client.list_provisioning_artifacts(ProductId=productId)
        ArtifactId = ProvisioningArtifactId['ProvisioningArtifactDetails'][0]['Id']
        response = client.update_provisioned_product(ProvisionedProductName=productName, ProductId=productId, ProvisioningArtifactId=ArtifactId, ProvisioningParameters=paramlist)
        print(response)
    except Exception as e:
        error = "An error occurred processing this request: " + str(e)
        print(error)

def deletestack(productName):
    try:
        client = boto3.client('servicecatalog', region_name='us-east-1')
        response = client.terminate_provisioned_product(ProvisionedProductName=productName)
        print(response)
        return response
    except Exception as e:
        error = "An error occurred processing this request: " + str(e)
        return(error)

def init():
    #global args
    with open("list_provisional_product.json") as f:
        product_list = json.load(f)
    with open("testing-pipeline-params.json") as f:
        baselist = json.load(f)

    for product in product_list["update_products"]:
        for provisioned_product_name in product["provisioned_product_names"]:
            updatestack(productName=provisioned_product_name, productId=product["product_id"], paramlist=baselist[provisioned_product_name])

    for product in product_list["delete_products"]:
        for provisioned_product_name in product["provisioned_product_names"]:
            deletestack(productName=provisioned_product_name)

    for product in product_list["create_products"]:
        for provisioned_product_name in product["provisioned_product_names"]:
            createstack(productName=provisioned_product_name, productId=product["product_id"], paramlist=baselist[provisioned_product_name])


def main():
    init()
if __name__== "__main__": 
    main()