# get command line args into a dictionary for parsing
# get a name list file into a dictionary for look up

d = { "a":"alpha", "g":"gamma", "d":"delta", 7:11.25}
print d
print type(d)
print len(d)

print d.keys()

# key:value pairs, also known as mapping; can be different data types
# dictionaries are unordered so numerical indexing does not work
#  appear to be internally sorted alphabetically
# dictionary is indexed by key instead of a numerical index

for j in d:		# magic iterator return elements from list of keys
	print j
	print "   the key is a " + str(type(j))
	v = d.get(j)	# python magic:  v = d[j]; index by key instead of number
	print v
	print "   the value is a " + str(type(v))

import sys		# import can be anywhere in code, usually at beginning
print sys.argv		# sys.argv is a list of command line arguments starting with programName

# command line usage:  python program.py -d directory -f nFrames -o outputfile
#                                       arguments can be in any order and optional

eD = {}		# lists, tuples, dictionaries have to be declared, unlike int, float
		# convention is add letter for datatype at end of variable name

for j in range(1, len(sys.argv), 2):	# range can have a skip factor
	print sys.argv[j], sys.argv[j+1]
	eD[sys.argv[j]] = sys.argv[j+1]

print eD

print "the output file will be " + eD["-o"]
print "the number of frames will be " + eD["-f"]

'''
a = 1
b = 2
print a; print b	# ; generally not used;  can separate 2 statements on same line

e = {}
print e
print type(e)

e['hello'] = "goodbye"
print e
'''