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141 lines
4.0 KiB
Python
141 lines
4.0 KiB
Python
#!/usr/bin/python -tt
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# Copyright 2010 Google Inc.
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# Licensed under the Apache License, Version 2.0
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# http://www.apache.org/licenses/LICENSE-2.0
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# Google's Python Class
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# http://code.google.com/edu/languages/google-python-class/
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# Basic string exercises
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# Fill in the code for the functions below. main() is already set up
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# to call the functions with a few different inputs,
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# printing 'OK' when each function is correct.
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# The starter code for each function includes a 'return'
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# which is just a placeholder for your code.
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# It's ok if you do not complete all the functions, and there
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# are some additional functions to try in string2.py.
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# A. donuts
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# Given an int count of a number of donuts, return a string
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# of the form 'Number of donuts: <count>', where <count> is the number
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# passed in. However, if the count is 10 or more, then use the word 'many'
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# instead of the actual count.
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# So donuts(5) returns 'Number of donuts: 5'
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# and donuts(23) returns 'Number of donuts: many'
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def donuts(count):
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# +++your code here+++
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# LAB(begin solution)
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if count < 10:
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return 'Number of donuts: ' + str(count)
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else:
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return 'Number of donuts: many'
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# LAB(replace solution)
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# return
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# LAB(end solution)
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# B. both_ends
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# Given a string s, return a string made of the first 2
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# and the last 2 chars of the original string,
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# so 'spring' yields 'spng'. However, if the string length
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# is less than 2, return instead the empty string.
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def both_ends(s):
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# +++your code here+++
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# LAB(begin solution)
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if len(s) < 2:
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return ''
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first2 = s[0:2]
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last2 = s[-2:]
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return first2 + last2
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# LAB(replace solution)
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# return
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# LAB(end solution)
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# C. fix_start
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# Given a string s, return a string
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# where all occurences of its first char have
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# been changed to '*', except do not change
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# the first char itself.
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# e.g. 'babble' yields 'ba**le'
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# Assume that the string is length 1 or more.
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# Hint: s.replace(stra, strb) returns a version of string s
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# where all instances of stra have been replaced by strb.
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def fix_start(s):
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# +++your code here+++
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# LAB(begin solution)
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front = s[0]
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back = s[1:]
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fixed_back = back.replace(front, '*')
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return front + fixed_back
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# LAB(replace solution)
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# return
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# LAB(end solution)
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# D. MixUp
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# Given strings a and b, return a single string with a and b separated
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# by a space '<a> <b>', except swap the first 2 chars of each string.
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# e.g.
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# 'mix', pod' -> 'pox mid'
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# 'dog', 'dinner' -> 'dig donner'
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# Assume a and b are length 2 or more.
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def mix_up(a, b):
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# +++your code here+++
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# LAB(begin solution)
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a_swapped = b[:2] + a[2:]
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b_swapped = a[:2] + b[2:]
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return a_swapped + ' ' + b_swapped
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# LAB(replace solution)
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# return
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# LAB(end solution)
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# Provided simple test() function used in main() to print
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# what each function returns vs. what it's supposed to return.
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def test(got, expected):
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if got == expected:
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prefix = ' OK '
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else:
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prefix = ' X '
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print(('%s got: %s expected: %s' % (prefix, repr(got), repr(expected))))
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# Provided main() calls the above functions with interesting inputs,
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# using test() to check if each result is correct or not.
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def main():
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print('donuts')
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# Each line calls donuts, compares its result to the expected for that call.
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test(donuts(4), 'Number of donuts: 4')
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test(donuts(9), 'Number of donuts: 9')
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test(donuts(10), 'Number of donuts: many')
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test(donuts(99), 'Number of donuts: many')
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print()
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print('both_ends')
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test(both_ends('spring'), 'spng')
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test(both_ends('Hello'), 'Helo')
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test(both_ends('a'), '')
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test(both_ends('xyz'), 'xyyz')
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print()
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print('fix_start')
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test(fix_start('babble'), 'ba**le')
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test(fix_start('aardvark'), 'a*rdv*rk')
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test(fix_start('google'), 'goo*le')
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test(fix_start('donut'), 'donut')
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print()
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print('mix_up')
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test(mix_up('mix', 'pod'), 'pox mid')
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test(mix_up('dog', 'dinner'), 'dig donner')
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test(mix_up('gnash', 'sport'), 'spash gnort')
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test(mix_up('pezzy', 'firm'), 'fizzy perm')
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# Standard boilerplate to call the main() function.
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if __name__ == '__main__':
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main()
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