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01_string2.py
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01_string2.py
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#!/usr/bin/python
#PERFORMED BY: alexxa
#DATE: 19.12.2013
#SOURCE: Google Python course
# https://developers.google.com/edu/python/
#PURPOSE: Basics. Strings
# The original course and exercises are in Python 2.4
# But I performed them in Python 3
# Copyright 2010 Google Inc.
# Licensed under the Apache License, Version 2.0
# http://www.apache.org/licenses/LICENSE-2.0
# Google's Python Class
# http://code.google.com/edu/languages/google-python-class/
# Additional basic string exercises
# D. verbing
# Given a string, if its length is at least 3,
# add 'ing' to its end.
# Unless it already ends in 'ing', in which case
# add 'ly' instead.
## Hm. It seems smth is wrong here, see testing function
# If the string length is less than 3, leave it unchanged.
# Return the resulting string.
def verbing(s):
if len(s) >= 3:
if s[-3:] != 'ing':
s = s + 'ing'
else:
s = s + 'ly'
return s
# E. not_bad
# Given a string, find the first appearance of the
# substring 'not' and 'bad'. If the 'bad' follows
# the 'not', replace the whole 'not'...'bad' substring
# with 'good'.
# Return the resulting string.
# So 'This dinner is not that bad!' yields:
# This dinner is good!
def not_bad(s):
no = s.find('not')
bad = s.find('bad')
if no != -1 and bad != -1 and no < bad:
s = s[:no] + 'good' + s[bad+3:]
return s
# F. front_back
# Consider dividing a string into two halves.
# If the length is even, the front and back halves are the same length.
# If the length is odd, we'll say that the extra char goes in the front half.
# e.g. 'abcde', the front half is 'abc', the back half 'de'.
# Given 2 strings, a and b, return a string of the form
# a-front + b-front + a-back + b-back
def front_back(a, b):
a_middle = int(len(a)/2)
b_middle = int(len(b)/2)
if len(a)%2 == 1:
a_middle = a_middle+1
if len(b)%2 == 1:
b_middle = b_middle+1
return a[:a_middle] + b[:b_middle] + a[a_middle:] + b[b_middle:]
# Simple provided test() function used in main() to print
# what each function returns vs. what it's supposed to return.
def test(got, expected):
if got == expected:
prefix = ' OK '
else:
prefix = ' X '
print('{} got: {} expected: {}'.format(prefix, repr(got), repr(expected)))
# main() calls the above functions with interesting inputs,
# using the above test() to check if the result is correct or not.
def testing():
print('verbing')
test(verbing('hail'), 'hailing')
test(verbing('swiming'), 'swimingly')
test(verbing('do'), 'do')
print('\nnot_bad')
test(not_bad('This movie is not so bad'), 'This movie is good')
test(not_bad('This dinner is not that bad!'), 'This dinner is good!')
test(not_bad('This tea is not hot'), 'This tea is not hot')
test(not_bad("It's bad yet not"), "It's bad yet not")
print('\nfront_back')
test(front_back('abcd', 'xy'), 'abxcdy')
test(front_back('abcde', 'xyz'), 'abcxydez')
test(front_back('Kitten', 'Donut'), 'KitDontenut')
testing()
#if __name__ == '__main__':
# main()