A python command-line tool template

tool_template.py

#!/usr/bin/python
import getopt, sys, os, shutil
import subprocess, codecs

def main():
	METHOD = None

	args = []
	kwargs = {}	

	try:
		opts, args = getopt.getopt(sys.argv[1:], "hc", [
			"help", 
			"copy",
			"src=",
			"dest="])
	except getopt.GetOptError as err:
		print str(err)
		usage()
		sys.exit(2)

	for o, a in opts:
		if o in ("--src"):
			kwargs['src'] = a

		if o in ("--dest"):
			kwargs['dest'] = a

		if o in ["-h", "--help"]:
			METHOD = "usage"
		elif o in ['-c', '--copy']:
			METHOD = "copier"

	if METHOD is None:
		usage()
		assert False, "Unknown Command."
		sys.exit(2)

	globals()[METHOD](*args, **kwargs)
	sys.exit(0)

def usage(*args, **kwargs):
	print "-----------------------------------------------------"
	print " My Custom Tool "
	print "-----------------------------------------------------"
	print " "
	print " --help                Display this help"
	print " --copy                Copy files"
	print "   --src               Source of files"
	print "   --dest              Destination for files"
	print " "
	print "-----------------------------------------------------"

def copier(*args, **kwargs):
	if 'src' not in kwargs:
		assert False, "--src parameter missing"
		sys.exit(1)
	
	if 'dest' not in kwargs:
		assert False, "--dest parameter missing"
		sys.exit(1)
	
	shutil.copytree(kwargs['src'], kwargs['dest'])

if __name__ == "__main__":
	main()