title: TypeError: %d format: a number is required, not getset_descriptor
body: <p>I am trying to code a script that finds out the current date and time and then creates a folder with a name based on this. 
  I get this error when I try to run my code: </p>
  
  <blockquote>
    <p>TypeError: %d format: a number is required, not getset_descriptor</p>
  </blockquote>
  
  <p>This is my code:</p>
  
  <pre><code>import os
  import time
  #import RPi.GPIO as GPIO
  import logging
  import sys
  from datetime import datetime
  d = datetime
  initYear = "%04d" % (d.year) 
  initMonth = "%02d" % (d.month) 
  initDate = "%02d" % (d.day)
  initHour = "%02d" % (d.hour)
  initMins = "%02d" % (d.minute)ion where you wish to save files. Set to HOME as default.
  # If you run a local web server on Apache you could set this to /var/www/ to make them
  # accessible via web browser.
  folderToSave = "/home/timelapse/timelapse_" + str(initYear) + str(initMonth) + str(initDate) +        str(initHour) + str(initMins)
  #os.mkdir(folderToSave)
  # Set the initial serial for saved images to 1
  fileSerial = 1
  a = 'timefile'
  
  # Run a WHILE Loop of infinity
  while True:
       if os.path.isfile(a) == False:
      # Set FileSerialNumber to 000X using four digits
      fileSerialNumber = "%04d" % (fileSerial)
      # Capture the CURRENT time (not start time as set above) to insert into each capture image filename
      hour = "%02d" % (d.hour)
      mins = "%02d" % (d.minute)
      # Define the size of the image you wish to capture.
      imgWidth = 800 # Max = 2592
      imgHeight = 600 # Max = 1944
      print " ====================================== Saving file at " + hour + ":" + mins
      # Capture the image using raspistill. Set to capture with added sharpening, auto white balance and average metering mode
      # Change these settings where you see fit and to suit the conditions you are using the camera in
      os.system("raspistill -w " + str(imgWidth) + " -h " + str(imgHeight) + " -o " + str(folderToSave) + "/" + str(fileSerialNumber) + "_" + str(hour) + str(mins) +  ".jpg  -sh 40 -awb auto -mm average -v")
      # Increment the fileSerial
      fileSerial += 1
      # Wait 10 minutes before next capture
      time.sleep(600)
  else:
      os.remove(time.txt)
  os.system("sudo shutdown -h -P now")
  break
  print "Quitting now."
  sys.exit(0)
  </code></pre>
  
  <p>I think the code has an error here:</p>
  
  <pre><code>initYear = "%04d"
  </code></pre>
  
  <p>The error seems to be around the "%04d" part. Any suggestions or help would be appreciated. Thanks in advance.</p>