# Imports
import sys	# For argv
import os	# For system
import glob	# For globbing

# Variables do not have to be initialized and do not have type
myVar = 0
myString = 'one'
myList = [1, 2, 3]
myDict = { 1: "first", 2: "second" }	# dictionary is a hashtable

print "Vars: ", myVar, myString, myList[0], myDict[1]

# Command line arguments are an array of string
print "Number of args: ", len(sys.argv),	# Trailing comma suppresses new line
print " Program name: ", sys.argv[0]

# for loop
for i in (1,2,3,4,5,6):	 # Also: for i in range(1,6)

	if ( i == 5 ):
		os.system('uname -a')		
	elif ( i == 6 ):
		print "Concat" + "enated"
	else:
		pass	# Comment, do nothing

# file processing

file = open("crib-test.txt", "w")
file.write("comma,separated,file\n")
file.writelines(["and,several,lines\n", "at,that,eh\n"])
file.close()

file = open("crib-test.txt", "r")
allLines = file.readlines()
file.close()
print "File contains: ", allLines

for lineNum in range( len(allLines) ):
	splitLine = allLines[lineNum].split(',')	# Split string on ',' into array
	splitLine[1] = splitLine[1].capitalize()
	allLines[lineNum] = ','.join(splitLine)  # Turn ["one", "two"] into "one,two"

print "Lines after: ", allLines

# Files in directory
allFiles = glob.glob("*")
fileIndex = 0
while fileIndex < len(allFiles):
	filename = allFiles[fileIndex]
	print filename +": ",
	sys.stdout.flush()	# Otherwise 'system' output gets there first
	retVal = os.system("sum %s" % filename)	# Grab return value so that it does not appear on screen
	fileIndex += 1

# Functional programming

# map() performs the passed function on each tem in the list and returns a list of results
# for e in lst: func(e) is the same as map(func, lst)

# reduce() performs the passed function on each subsequent item and an internal accumulator of the final result.
# reduce( func, list )

# filter() uses the passed function to evaluate each item in a list and returns a list of the elements that passed
# filter( func, list )