Miscellaneous operating system functions¶
-
sage.misc.sage_ostools.
have_program
(program, path=None)¶ Return
True
if aprogram
executable is found in the path given bypath
.INPUT:
program
- a string, the name of the program to check.path
- string or None. Paths to search forprogram
, separated byos.pathsep
. IfNone
, use thePATH
environment variable.
OUTPUT: bool
EXAMPLES:
sage: from sage.misc.sage_ostools import have_program sage: have_program('ls') True sage: have_program('there_is_not_a_program_with_this_name') False sage: have_program('ls', path=SAGE_ROOT) False
-
sage.misc.sage_ostools.
restore_cwd
(*args, **kwds)¶ Context manager that restores the original working directory upon exiting.
INPUT:
chdir
– optionally change directories to the given directory upon entering the context manager
EXAMPLES:
sage: import os sage: from sage.misc.sage_ostools import restore_cwd sage: from sage.misc.misc import SAGE_TMP sage: cwd = os.getcwd() sage: with restore_cwd(str(SAGE_TMP)): ….: print(os.getcwd() == SAGE_TMP) True sage: cwd == os.getcwd() True