Simple Python script to cap disk space of a folder

gistfile1.py

import os

cap = 1 # cap in Megabytes

from datetime import date, timedelta
from time import gmtime
cutoffDate = date.today()-timedelta(days=1)  # does not delete files newer than this (exclusive of the date)

def GetFolderSize(start_path = '.'):  #get disk space in Megabytes
    return sum(os.path.getsize(f) for f in os.listdir('.') if os.path.isfile(f)) / (1024*1024)

if GetFolderSize() > cap:
    for file in os.listdir('.'):
        if os.path.isfile(file) and f != os.path.basename(__file__):
            if gmtime(os.path.getmtime(file)) <= cutoffDate.timetuple():
                os.remove(file)