#!/usr/bin/python

# P2PU - Python Programming - Chapter 5 - Datatypes
# Chapter 6 - Strings
print 'Python for Informatics - Chapter 6: Strings'

# Exercise 6.1
print '\n# Exercise 6.1\n'
inp =  raw_input('Enter a word: ')
index = len(inp) - 1
while index >= 0:
  print inp[index]
  index -= 1

# Exercise 6.2
# fruit[:}
# I just tried it out and it returns the complete string.
# If you omit the first index the slice starts at the beginning.
# If you omit the second index, the slice goes to the end.
# So I should have seen it coming.

# Exercise 6.3
print '\n# Exercise 6.3\n'
def counter(haystack, needle):
    count = 0
    for letter in haystack:
        if letter == needle:
            count = count + 1
    print count

word   = raw_input('Enter a word: ')
letter = raw_input('Letter to search for: ')
counter(word, letter)

# Exercise 6.4
print '\n# Exercise 6.4\n'
word   = raw_input('Enter a word: ')
letter = raw_input('Letter to search for: ')
print word.count(letter)

# Exercise 6.5
print '\n# Exercise 6.5\n'
inp = raw_input('Press <enter> to continue')
str = 'X-DSPAM-Confidence:  0.8475'
newstr = str[str.find(':')+1:]
print float(newstr)

# Exercise 6.6
print '\n# Exercise 6.6\n'
inp = raw_input('Press <enter> to continue')
print '- Using the center method:\n'
i = 0
while i < 15:
    str = '*' * (i * 2 + 1)
    print str.center(70)
    i += 1
print '\n- Using the replace method:\n'
str = 'And then Romeo met Julia.'
print 'Original text:', str
str = str.replace('Romeo', 'Romea')
str = str.replace('Julia', 'Julio')
print 'Replaced text:', str
print '\n- Using the zfill method:\n'
i = 0
while i < 11:
    print repr(i).zfill(3)
    i += 1
print '\n- Using some various methods:\n'
str = 'And then Romeo met Julia.'
print 'Original text  :', str
print 'All uppercase  :', str.upper()
print 'All lowercase  :', str.lower()
print 'Capitalize     :', str.capitalize()
print 'Title          :', str.title()
print 'Swapcase       :', str.swapcase()
print 'Startswith And :', str.startswith('And')
print 'Startswith Or  :', str.startswith('Or')
print 'Endswith Julia :', str.endswith('Julia')
print 'Endswith Julia.:', str.endswith('Julia.')
print 'Count letter t :', str.count('t'), 'times'