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    <p>This is kind of tricky, but given the source code (or a good python decompiler), you can do this:</p> <p>in 'nine.py':</p> <pre><code>def number_nine(): x = 9 if x == 9: print 'x is Nine!' else: print 'x:', x </code></pre> <p>Your evil code:</p> <pre><code>from nine import number_nine </code></pre> <p>We need to use ast, which is <a href="http://docs.python.org/library/ast.html" rel="nofollow">Abstract Syntax Trees</a>:</p> <pre><code>import inspect import ast </code></pre> <p>Now we get the source and transform it to an ast:</p> <pre><code># Assuming you have the source, we can generate AST from it nine_src = inspect.getsource(number_nine) nine_ast = ast.parse(nine_src) </code></pre> <p>Isolate the specific statement you want to change:</p> <pre><code># This is the Assign object, which represents the 'x = 9' line # Try to run it interactivly and see how it looks... x_assign = nine_ast.body[0].body[0] # Prints 'x' print x_assign.targets[0].id # Prints 9 print x_assign.value.n </code></pre> <p>And alter it as you see fit:</p> <pre><code># Change the value of x # Notice, that we change the assignment itself, a.k.a `x = 9` is now `x = "It's a trap!"` x_assign.value.n = "It's a trap!" </code></pre> <p>Now all that is left to do is to compile your modified ast object to something more useful:</p> <pre><code># Compile the new function new_nine = compile(nine_ast, 'new_nine', 'exec') </code></pre> <p>You can use simple <code>exec</code> (which will replace 'number_nine' if it is in <code>globals</code>), or <code>exec in</code>, and place it in a temp module:</p> <pre><code># Now we need to execute our litle new_nine (which is a code object) # This to create the modified version in 'm' import types m = types.ModuleType('m', 'The m module') exec new_nine in m.__dict__ m.number_nine() # Or this to create it in the global scope exec new_nine number_nine() </code></pre> <p>And bang! it prints <code>x: It's a trap!</code></p>
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    1. POusing python inspect to view local variables in a function
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    1. COIn my example nine.py is already running (note the while loop) and I need to inspect that process. Inspect_shell is supposed to expose everything in that process via a socket. (see links to inspect_shell docs) I cannot stop and recompile any part my real-world problem. I've attempted to make my question more clear. Thank you for the response.
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