#!/usr/bin/env python
import datetime
import boto3

now = datetime.datetime.now()

START = "{}-{}-01".format(now.year, now.month)
END = "{}-{}-{}".format(now.year, now.month, now.day)

client = boto3.client('ce', 'us-east-1')
a = client.get_cost_and_usage(
    TimePeriod={"Start": START, "End": END},
    Granularity="MONTHLY",
    Metrics=["UnblendedCost"],
)

print("Total spend from {} to {} is {} USD".format(
    START, END, a['ResultsByTime'][0]['Total']['UnblendedCost']['Amount']))