# funtional programming is passing functions as an argument to a function

# below hex,ord,sum are some functions

import re

print '\n\n'

print '1 ----------- with inbuilt functions ------------------------'

items = [2, 1, 3, 4, 5, 6, 7, 8]

temp = map(hex, items)

print temp

print

ascii = map(ord, 'peter pan')

print ascii

print

print map(sum, [[1,2,3], [5,6,7], [8,9,0]]) # for each element the sum method is called, so map loops internally

print '\n\n'

print '2 ------------- with user defined funtions ----------------------'

ascii = [112, 101, 116, 101, 32, 112, 97, 110]

def tag_it(av):

return 'ascii char="{}">{}</ascii>'.format(chr(av), av)

print map(tag_it, ascii)

print

print tag_it

print '\n\n'

print '3 ------------- using lambda ----------------------'

ascii = [112, 101, 116, 101, 32, 112, 97, 110]

print map(lambda av: 'ascii char="{}">{}</ascii>'.format(chr(av), av), ascii)

print

print tag_it

print '\n\n'

print '4 ------------- functional programmng using filter ----------------------'

items = range(1, 55)

print items

print

print filter(lambda n: n%7==0, items) # print multiples of 7

print '\n\n'

print '5 ------------- functional programmng using filter and lambda for file operations ----------------------'

pattern = 'root'

mlines =filter(lambda line: re.search(pattern, line, re.I), open('resources/passwd.txt'))

for line in mlines:

print line