You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
3.0 KiB
Python
93 lines
3.0 KiB
Python
# encoding: utf-8
|
|
"""
|
|
Utilities for working with stack frames.
|
|
"""
|
|
|
|
#-----------------------------------------------------------------------------
|
|
# Copyright (C) 2008-2011 The IPython Development Team
|
|
#
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
# the file COPYING, distributed as part of this software.
|
|
#-----------------------------------------------------------------------------
|
|
|
|
#-----------------------------------------------------------------------------
|
|
# Imports
|
|
#-----------------------------------------------------------------------------
|
|
|
|
import sys
|
|
|
|
#-----------------------------------------------------------------------------
|
|
# Code
|
|
#-----------------------------------------------------------------------------
|
|
|
|
def extract_vars(*names,**kw):
|
|
"""Extract a set of variables by name from another frame.
|
|
|
|
Parameters
|
|
----------
|
|
*names : str
|
|
One or more variable names which will be extracted from the caller's
|
|
frame.
|
|
**kw : integer, optional
|
|
How many frames in the stack to walk when looking for your variables.
|
|
The default is 0, which will use the frame where the call was made.
|
|
|
|
Examples
|
|
--------
|
|
::
|
|
|
|
In [2]: def func(x):
|
|
...: y = 1
|
|
...: print(sorted(extract_vars('x','y').items()))
|
|
...:
|
|
|
|
In [3]: func('hello')
|
|
[('x', 'hello'), ('y', 1)]
|
|
"""
|
|
|
|
depth = kw.get('depth',0)
|
|
|
|
callerNS = sys._getframe(depth+1).f_locals
|
|
return dict((k,callerNS[k]) for k in names)
|
|
|
|
|
|
def extract_vars_above(*names):
|
|
"""Extract a set of variables by name from another frame.
|
|
|
|
Similar to extractVars(), but with a specified depth of 1, so that names
|
|
are extracted exactly from above the caller.
|
|
|
|
This is simply a convenience function so that the very common case (for us)
|
|
of skipping exactly 1 frame doesn't have to construct a special dict for
|
|
keyword passing."""
|
|
|
|
callerNS = sys._getframe(2).f_locals
|
|
return dict((k,callerNS[k]) for k in names)
|
|
|
|
|
|
def debugx(expr,pre_msg=''):
|
|
"""Print the value of an expression from the caller's frame.
|
|
|
|
Takes an expression, evaluates it in the caller's frame and prints both
|
|
the given expression and the resulting value (as well as a debug mark
|
|
indicating the name of the calling function. The input must be of a form
|
|
suitable for eval().
|
|
|
|
An optional message can be passed, which will be prepended to the printed
|
|
expr->value pair."""
|
|
|
|
cf = sys._getframe(1)
|
|
print('[DBG:%s] %s%s -> %r' % (cf.f_code.co_name,pre_msg,expr,
|
|
eval(expr,cf.f_globals,cf.f_locals)))
|
|
|
|
|
|
# deactivate it by uncommenting the following line, which makes it a no-op
|
|
#def debugx(expr,pre_msg=''): pass
|
|
|
|
def extract_module_locals(depth=0):
|
|
"""Returns (module, locals) of the function `depth` frames away from the caller"""
|
|
f = sys._getframe(depth + 1)
|
|
global_ns = f.f_globals
|
|
module = sys.modules[global_ns['__name__']]
|
|
return (module, f.f_locals)
|