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POusing python inspect to view local variables in a function
 

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  1. POusing python inspect to view local variables in a function
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    <p>I can't figure out how to inspect a currently executing function using <a href="http://docs.python.org/library/inspect.html" rel="nofollow">inspect</a> / <a href="https://github.com/amoffat/Inspect-Shell" rel="nofollow">inspect_shell</a></p> <p>I'm guessing it involves walking the frame hierarchy using getinnerframe and getouterframe, but I'm confused on several issues.</p> <p>Given this example nine.py:</p> <pre><code>import inspect_shell import time def number_nine(): x = 9 while x==9: time.sleep(1) number_nine() print x </code></pre> <p>I would like to inspect the value of <code>x</code> or even possibly change it to cause the function to return and print the new value.</p> <p>First I launch nine.py, then in a separate command window, using <a href="https://github.com/amoffat/Inspect-Shell" rel="nofollow">inspect_shell</a>, I see that <code>getinnerframes</code> does not work on the current frame (it needs a trace (perhaps?)) and the current frame has no "trace". and <code>getouterframes</code> (in case I'm thinking about this backwards) seems to get only frames that have nothing to do with my function.</p> <pre><code>&gt;&gt; Inspect Shell v1.0 &gt;&gt; https://github.com/amoffat/Inspect-Shell localhost:1234&gt; import inspect localhost:1234&gt; f = inspect.currentframe() localhost:1234&gt; inspect.getinnerframes(f) Traceback (most recent call last): File "C:\Users\Paul\Desktop\inspect_shell.py", line 143, in run_repl try: exec compile(data, "&lt;dummy&gt;", "single") in f_globals, f_globals File "&lt;dummy&gt;", line 1, in &lt;module&gt; File "C:\Python26\lib\inspect.py", line 942, in getinnerframes framelist.append((tb.tb_frame,) + getframeinfo(tb, context)) AttributeError: 'frame' object has no attribute 'tb_frame' localhost:1234&gt; dir(f) ['__class__', '__delattr__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'f_back', 'f_builtins', 'f_code', 'f_exc_traceback', 'f_exc_type', 'f_exc_value', 'f_glo bals', 'f_lasti', 'f_lineno', 'f_locals', 'f_restricted', 'f_trace'] localhost:1234&gt; print f.f_trace None localhost:1234&gt; inspect.getouterframes(f) [(&lt;frame object at 0x0237D470&gt;, '&lt;dummy&gt;', 1, '&lt;module&gt;', None, None), (&lt;frame object at 0x02375938&gt;, 'C:\\Users\\Paul\\Desktop\\inspect_shell.py', 14 3, 'run_repl', [' try: exec compile(data, "&lt;dummy&gt;", "single") in f_globals, f_globals\n'], 0), (&lt;frame object at 0x023A2C30&gt;, 'C:\ \Python26\\lib\\threading.py', 484, 'run', [' self.__target(*self.__args, **self.__kwargs)\n'], 0), (&lt;frame object at 0x02397F28&gt;, 'C:\ \Python26\\lib\\threading.py', 532, '__bootstrap_inner', [' self.run()\n'], 0), (&lt;frame object at 0x023A9D68&gt;, 'C:\\Python26\\lib\\thre ading.py', 504, '__bootstrap', [' self.__bootstrap_inner()\n'], 0)] </code></pre>
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