Pulling temperature and humidity with a DHT22

#!/usr/bin/python
# Copyright (c) 2014 Adafruit Industries
# Author: Tony DiCola

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# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
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# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# SOFTWARE.
import sys
import time
import datetime
import Adafruit_DHT
import smtplib

# Import the email modules we'll need
from email.mime.text import MIMEText


# Parse command line parameters.
sensor = Adafruit_DHT.DHT22
pin = '4'

# Try to grab a sensor reading.  Use the read_retry method which will retry up
# to 15 times to get a sensor reading (waiting 2 seconds between each retry).
humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)

# Un-comment the line below to convert the temperature to Fahrenheit.
# temperature = temperature * 9/5.0 + 32

# Note that sometimes you won't get a reading and
# the results will be null (because Linux can't
# guarantee the timing of calls to read the sensor).
# If this happens try again!
if humidity is not None and temperature is not None:
    print('Temp={0:0.1f}*  Humidity={1:0.1f}%'.format(temperature, humidity))
    f = open("temp-log.csv", "a")
    f.write(str(datetime.datetime.now())+','+"{0:0.1f}, {1:0.1f}%".format(temperature, humidity)+'\n')
    if temperature >= 32:
        msg = MIMEText('Alert the garage temperature is: '+str(temperature))
        to = ''
        rom = ''
        msg['Subject'] = 'Garage Temperature Alert: '+str(temperature)
        msg['From'] = rom
        msg['To'] = to
        s = smtplib.SMTP('10.10.8.44')
        s.sendmail(rom, to, msg.as_string())
        s.quit()
        print('email sent')

    sys.exit(1)
else:
    print('Failed to get reading. Try again!')
    sys.exit(1)