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#!/usr/bin/python

"""

P2PU Python 101- Chapter 8 Exercises

"""

import sys

def exercise8_1(list):

print '\n\nExercise 8.1'

print '=================================================='

def chop(list):

del list[0], list[-1:]

print list

chop(list)

exercise8_2()

def exercise8_2():

print '\n\nExercise 8.2'

print '=================================================='

#txt that'll break the book's code:

#From: nobody

#It'll give an out of range error on the last line 'print words[2]'

fhand = open('mbox-short.txt')

count = 0

for line in fhand:

words = line.split()

# print 'Debug:', words

if len(words) == 0 : continue

if words[0] != 'From' : continue

try:

print words[2]

except IndexError:

print 'no third word'

exercise8_3()

def exercise8_3():

print '\n\nExercise 8.3'

print '=================================================='

#txt that'll break the book's code:

#From: nobody

#It'll give an out of range error on the last line 'print words[2]'

fhand = open('mbox-short.txt')

count = 0

for line in fhand:

words = line.split()

# print 'Debug:', words

if len(words) == 0 or words[0] != 'From' : continue

try:

print words[2]

except IndexError:

print 'no third word'

exercise8_4('romeo.txt')

def exercise8_4(file):

print '\n\nExercise 8.4'

print '=================================================='

wordList = []

try:

f = open(file, 'rU');

for line in f:

words = line.split()

for word in words:

if word in wordList:

continue

else:

wordList.append(word)

print sorted(wordList)

except IOError:

print 'enter valid file name'

exercise8_5()

def exercise8_5():

print '\n\nExercise 8.5'

print '=================================================='

f = open('mbox.txt')

count = 0

for line in f:

words = line.split()

if len(words) == 0 or words[0] != 'From' : continue

try:

print words[1]

count += 1

except IndexError:

print 'no third word'

print 'There were',count,'lines with \'From\' as the first word'

exercise8_6()

def exercise8_6():

print '\nExercise 8.6'

numbers = []

minum = None

maxnum = None

while True:

line = raw_input('Enter a Number: ')

if line == 'done':

print max(numbers),min(numbers)

break

else:

try:

float(line)

numbers.append(line)

continue

except ValueError:

print 'ERROR, please enter a number'

continue

def main():

args = sys.argv[1:]

if not args:

print 'usage: python ./chapter8.py [list of stuff to pass to exercise 8.1]'

sys.exit(1)

exercise8_1(args)

if __name__ == '__main__':

main()