.. function:: effective(file, line, frame)
Determine if there is an effective (active) breakpoint at this line of code.
- Return breakpoint number or 0 if none.
-
- Called only if we know there is a breakpoint at this location. Returns the
- breakpoint that was triggered and a flag that indicates if it is ok to delete
- a temporary breakpoint.
+ Return a tuple of the breakpoint and a boolean that indicates if it is ok
+ to delete a temporary breakpoint. Return ``(None, None)`` if there is no
+ matching breakpoint.
.. function:: set_trace()
- Starts debugging with a :class:`Bdb` instance from caller's frame.
+ Start debugging with a :class:`Bdb` instance from caller's frame.
operating system::
>>> import os
- >>> os.system('time 0:02')
- 0
>>> os.getcwd() # Return the current working directory
'C:\\Python26'
- >>> os.chdir('/server/accesslogs')
+ >>> os.chdir('/server/accesslogs') # Change current working directory
+ >>> os.system('mkdir today') # Run the command mkdir in the system shell
+ 0
Be sure to use the ``import os`` style instead of ``from os import *``. This
will keep :func:`os.open` from shadowing the built-in :func:`open` function which
modules.
* The :mod:`ConfigParser` module uses them by default, meaning that
- configuration files can now read, modified, and then written back
+ configuration files can now be read, modified, and then written back
in their original order.
* The :meth:`~collections.somenamedtuple._asdict()` method for