Feb-15-2018, 11:09 AM
Hi Everyone,
I have just started learning Python on my own. I solved the string exercises given on Google's Python Learning website, https://developers.google.com/edu/python/strings
All the programs have been executed successfully. But as I am new to Python programming, I wanted to know if there is any better way to solve the problems. Please look at the codes below and let me know if you can think of any better way to solve the problems. The codes in red colour are written by me.
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I have just started learning Python on my own. I solved the string exercises given on Google's Python Learning website, https://developers.google.com/edu/python/strings
All the programs have been executed successfully. But as I am new to Python programming, I wanted to know if there is any better way to solve the problems. Please look at the codes below and let me know if you can think of any better way to solve the problems. The codes in red colour are written by me.
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#!/usr/bin/python -tt
# 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/
# Basic string exercises
# Fill in the code for the functions below. main() is already set up
# to call the functions with a few different inputs,
# printing 'OK' when each function is correct.
# The starter code for each function includes a 'return'
# which is just a placeholder for your code.
# It's ok if you do not complete all the functions, and there
# are some additional functions to try in string2.py.
# A. donuts
# Given an int count of a number of donuts, return a string
# of the form 'Number of donuts: <count>', where <count> is the number
# passed in. However, if the count is 10 or more, then use the word 'many'
# instead of the actual count.
# So donuts(5) returns 'Number of donuts: 5'
# and donuts(23) returns 'Number of donuts: many'
[color=#C0392B]def donuts(count):
# +++your code here+++
if count < 10:
return 'Number of donuts: ' + str(count)
else:
return 'Number of donuts: many'
[/color]
# B. both_ends
# Given a string s, return a string made of the first 2
# and the last 2 chars of the original string,
# so 'spring' yields 'spng'. However, if the string length
# is less than 2, return instead the empty string.
[color=#C0392B]def both_ends(s):
# +++your code here+++
if (len(s) < 2):
return ''
else:
return s[:2] + s[-2:]
[/color]
# C. fix_start
# Given a string s, return a string
# where all occurences of its first char have
# been changed to '*', except do not change
# the first char itself.
# e.g. 'babble' yields 'ba**le'
# Assume that the string is length 1 or more.
# Hint: s.replace(stra, strb) returns a version of string s
# where all instances of stra have been replaced by strb.
[color=#C0392B]def fix_start(s):
# +++your code here+++
testString=s[0]+s[1:].replace(s[0],'*')
return testString
[/color]
# D. MixUp
# Given strings a and b, return a single string with a and b separated
# by a space '<a> <b>', except swap the first 2 chars of each string.
# e.g.
# 'mix', pod' -> 'pox mid'
# 'dog', 'dinner' -> 'dig donner'
# Assume a and b are length 2 or more.
[color=#C0392B]def mix_up(a, b):
# +++your code here+++
testString=b[:2]+a[2:]+' '+a[:2]+b[2:]
return testString[/color]
# Provided simple 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 '%s got: %s expected: %s' % (prefix, repr(got), repr(expected))
# Provided main() calls the above functions with interesting inputs,
# using test() to check if each result is correct or not.
def main():
print 'donuts'
# Each line calls donuts, compares its result to the expected for that call.
test(donuts(4), 'Number of donuts: 4')
test(donuts(9), 'Number of donuts: 9')
test(donuts(10), 'Number of donuts: many')
test(donuts(99), 'Number of donuts: many')
print
print 'both_ends'
test(both_ends('spring'), 'spng')
test(both_ends('Hello'), 'Helo')
test(both_ends('a'), '')
test(both_ends('xyz'), 'xyyz')
print
print 'fix_start'
test(fix_start('babble'), 'ba**le')
test(fix_start('aardvark'), 'a*rdv*rk')
test(fix_start('google'), 'goo*le')
test(fix_start('donut'), 'donut')
print
print 'mix_up'
test(mix_up('mix', 'pod'), 'pox mid')
test(mix_up('dog', 'dinner'), 'dig donner')
test(mix_up('gnash', 'sport'), 'spash gnort')
test(mix_up('pezzy', 'firm'), 'fizzy perm')
# Standard boilerplate to call the main() function.
if __name__ == '__main__':
main()