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Bernardo Sulzbach 2014-07-07 20:00:13 -03:00
parent a071c64242
commit e3bc4378aa
1 changed files with 5 additions and 33 deletions
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38
src/further_examples/arrays_and_strings/reverse_str.py
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@ -1,32 +1,3 @@
#!/usr/bin/python3
<<<<<<< HEAD
=======
# mari von steinkirch @2013
# steinkirch at gmail
def reverse_str(s):
''' in place '''
sr_ls = []
for i in range(len(s)-1, -1, -1):
sr_ls.append(s[i])
return ''.join(sr_ls)
def main():
s1 = 'abcdefg'
s2 = 'buffy'
s3 = ''
print(reverse_str(s1))
print(reverse_str(s2))
print(reverse_str(s3))
if __name__ == '__main__':
main()
>>>>>>> parent of 7b79f58... Faster, better, stronger
# Mari von Steinkirch @ 2013 # Mari von Steinkirch @ 2013
# mari.wahl9@gmail.com # mari.wahl9@gmail.com
@ -74,12 +45,10 @@ def reverse_3(string):
# Simply returns the string backwards. As fast as concise. # Simply returns the string backwards. As fast as concise.
reverse_lambda = lambda s: s[::-1] reverse_lambda = lambda s: s[::-1]
# Import a lowercase ASCII alphabet from the string module.
from string import ascii_lowercase
# We define some short strings to test our functions. # We define some short strings to test our functions.
strings = (ascii_lowercase, 'buffy', 'foo', 'bar', 'SPAM') strings = ('buffy', 'foo', 'bar')
# We announce what we are doing. # We announce what we are doing.
print(', '.join(strings), ' should appear reversed four times if all the functions are working.\n') print(', '.join(strings), ' should appear reversed four times if the function is working.\n')
print('{:<30}:'.format('Function name'), 'benchmarking result (lower is better):') print('{:<30}:'.format('Function name'), 'benchmarking result (lower is better):')
# Iterate over a tuple of functions. # Iterate over a tuple of functions.
for function in (reverse_1, reverse_2, reverse_3, reverse_lambda): for function in (reverse_1, reverse_2, reverse_3, reverse_lambda):
@ -88,3 +57,6 @@ for function in (reverse_1, reverse_2, reverse_3, reverse_lambda):
print("{:<30}:".format(name), timeit(name + "('string')", setup='from __main__ import ' + name)) print("{:<30}:".format(name), timeit(name + "('string')", setup='from __main__ import ' + name))
# We print the output so that we can check if the function is working as expected. # We print the output so that we can check if the function is working as expected.
print(', '.join(map(function, strings)), '\n') print(', '.join(map(function, strings)), '\n')
# So that the console stays open and waits the user to kill it.
from os import system
system('pause')