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PO
 

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    <p>A few minutes of hacking around gives me this Read-Eval-Print Loop in Python 2.7:</p> <pre><code>#!/usr/bin/env python import code import sys LINE_NUMBER=0 def reset_linenum(): global LINE_NUMBER LINE_NUMBER=-1 def resettable_REPL(): global LINE_NUMBER BUFFERED_LINES=[] ii=code.InteractiveInterpreter({"reset_linenum":reset_linenum}) while True: try: BUFFERED_LINES.append(raw_input("!"+sys.ps1)+'\n') while (BUFFERED_LINES[-1][:1] in " \t" or ii.runsource("\n"*LINE_NUMBER+"".join(BUFFERED_LINES), "console")): BUFFERED_LINES.append(raw_input("!"+sys.ps2)+'\n') LINE_NUMBER+=len(BUFFERED_LINES) BUFFERED_LINES=[] except EOFError: break if __name__=='__main__': resettable_REPL() </code></pre> <p>It's a bit hackish, but it keeps track of line numbers as the session continues, and allows the current count to be reset by a call to <code>reset_linenum()</code>. An example session:</p> <pre><code>!!!&gt; print "hello" # line 1 hello !!!&gt; def badfunc(): # line 2 !... raise Exception("doh") # line 3 !!!&gt; badfunc() # line 4 Traceback (most recent call last): File "console", line 4, in &lt;module&gt; File "console", line 3, in badfunc Exception: doh !!!&gt; ? # line 5 File "console", line 5 ? ^ SyntaxError: invalid syntax !!!&gt; reset_linenum() # RESET !!!&gt; raise Exception("!") # line 1 Traceback (most recent call last): File "console", line 1, in &lt;module&gt; Exception: ! !!!&gt; </code></pre> <p><strong>EDIT</strong>: Fixed REPL to not execute indented blocks quite so prematurely.</p>
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    1. POHow to print absolute line number in uncaught exception?
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    1. POHow to print absolute line number in uncaught exception?
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    1. COSuper! Though it's a bit buggy and overkill, I think. ` !!!> # unique string id !!!> def usid(): !... global Uid !!!> Uid += 1 File "<string>", line None SyntaxError: unexpected indent (console, line 4) !!!> return str(Uid) # File "<string>", line None SyntaxError: unexpected indent (console, line 5)`
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    2. COYup, caught that problem after initial post. Try now?
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    3. COIt works. If nobody will post more "lightweight" answer I'll accept this.
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