Mercurial > pylearn
annotate common/misc.py @ 359:9e73e6dc9823
Improved runcmd
| author | Joseph Turian <turian@iro.umontreal.ca> |
|---|---|
| date | Wed, 02 Jul 2008 15:42:42 -0400 |
| parents | faece52be094 |
| children | 0e3af3c53ac7 |
| rev | line source |
|---|---|
| 359 | 1 def runcmd(args): |
|
358
faece52be094
Added common.misc.runcmd
Joseph Turian <turian@iro.umontreal.ca>
parents:
357
diff
changeset
|
2 """ |
| 359 | 3 Split args into a list, run this command, and return its output. |
| 4 Raise RuntimeError if the command does not return 0. | |
|
358
faece52be094
Added common.misc.runcmd
Joseph Turian <turian@iro.umontreal.ca>
parents:
357
diff
changeset
|
5 """ |
| 359 | 6 import subprocess |
| 7 print args | |
| 8 import string | |
| 9 proc = subprocess.Popen(string.split(args), stdout=subprocess.PIPE) | |
| 10 output = proc.communicate()[0] | |
| 11 if proc.returncode != 0: | |
| 12 import exceptions | |
| 13 raise exceptions.RuntimeError | |
| 14 return output | |
|
358
faece52be094
Added common.misc.runcmd
Joseph Turian <turian@iro.umontreal.ca>
parents:
357
diff
changeset
|
15 |
| 355 | 16 def sign(i, assertions=True): |
| 17 """ | |
| 18 + or - 1 | |
| 19 @precondition: i != 0 | |
| 20 """ | |
| 21 if assertions: | |
| 22 assert i != 0 | |
| 23 else: | |
| 24 if i == 0: return 0 | |
| 25 | |
| 26 return +1 if i > 0 else -1 | |
| 27 | |
| 28 def unique_elements_list_intersection(list1,list2): | |
| 29 """ | |
| 30 Return the unique elements that are in both list1 and list2 | |
| 31 (repeated elements in listi will not be duplicated in the result). | |
| 32 This should run in O(n1+n2) where n1=|list1|, n2=|list2|. | |
| 33 """ | |
| 34 return list(set.intersection(set(list1),set(list2))) |