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selection_sort.py

 1 # The authors of this work have released all rights to it and placed it
 2 # in the public domain under the Creative Commons CC0 1.0 waiver
 3 # (http://creativecommons.org/publicdomain/zero/1.0/).
 4 # 
 5 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 6 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 7 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 8 # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 9 # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
10 # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
11 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
12 # 
13 # Retrieved from: http://en.literateprograms.org/Selection_sort_(Python,_arrays)?oldid=16034
14 
15 from numpy import *
16 def ssort(seq):
17     def rotate(xs): tmp = xs[-1]; xs[1:] = xs[:-1]; xs[0] = tmp
18     while len(seq):
19         rotate(seq[:argmin(seq)+1])
20         seq = seq[1:]
21 
22 if __name__ == "__main__":
23         r, s = random.random(12), arange(12)
24         ssort(r); ssort(s)
25         print s
26         print r
27         print alltrue(argsort(r) == arange(len(r)))


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