covid-19-growth.py

import math
import sys
from datetime import datetime

cases_til_date = int(sys.stdin.read())
first_us_case_date = datetime.strptime("01-19-20", "%m-%d-%y")
today = datetime.now()

# Using 2 as base
num_of_doubled = math.log(cases_til_date, 2)

doubling_rate = num_of_doubled/(today - first_us_case_date).days

projected_date = datetime.strptime("05-09-20", "%m-%d-%y")

projected_cases = 2**(doubling_rate*(projected_date - first_us_case_date).days)

print(f"{projected_cases:,}")