一个看起来好像没什么用的Python脚本。

magicpython

#!/usr/bin/env python

import os
import sys
import compiler

fsrc = open(sys.argv[1])
code = fsrc.read()
lines = code.split('\n')
fsrc.close()

stmt = compiler.parse(code).getChildNodes()[0].getChildNodes()

line_nos = map(lambda x: x.lineno, stmt) + [len(lines) + 1]

sub_globals = {}
sub_locals  = {}

for i, (start, stop) in enumerate(zip(line_nos, line_nos[1:])):
    block = lines[start-1:stop-1]
    nr_empty_lines = 0
    for line in reversed(block): #trailing empty lines
        if line.strip() == '':
            nr_empty_lines += 1
        else:
            break
    
    if nr_empty_lines == 0:
        codeblock = block
    else:
        codeblock = block[:-nr_empty_lines]
    
    code = '\n'.join(codeblock)
    if isinstance(stmt[i], compiler.ast.Discard):
        code = '____ret = ' + code
    
    print '>>>', block[0]
    for line in block[1:-nr_empty_lines]:
        print '...', line
    if len(codeblock) > 1:
        print '...'
        nr_empty_lines = max(0, nr_empty_lines - 1)
    
    try:
        exec(code, sub_globals, sub_locals)
        if isinstance(stmt[i], compiler.ast.Discard):
            print sub_locals['____ret']
    except Exception, e:
        print """Traceback (most recent call last): \n  File "<stdin>", line 1, in <module>"""
        print '%s: %s' % (e.__class__.__name__, e)
    
    for i in range(nr_empty_lines): print '>>> ' #necessary?