Python Standard Library

The rexec Module

The rexec module, shown in Example 14-6, provides versions of exec, eval, and import, which execute code in a restricted execution environment. In this environment, functions that can damage resources on the local machine are no longer available.

Example 14-6. Using the rexec Module

File: rexec-example-1.py

import rexec

r = rexec.RExec()
print r.r_eval("1+2+3")
print r.r_eval("_ _import_ _('os').remove('file')")

6
Traceback (innermost last):
  File "rexec-example-1.py", line 5, in ?
    print r.r_eval("_ _import_ _('os').remove('file')")
  File "/usr/local/lib/python1.5/rexec.py", line 257, in r_eval
    return eval(code, m._ _dict_ _)
  File "<string>", line 0, in ?
AttributeError: remove