Disassemble a python code object as a string

gistfile1.py

def disassemble(co, lasti=-1):
    """Disassemble a code object."""
    from dis import COMPILER_FLAG_NAMES, EXTENDED_ARG, HAVE_ARGUMENT, __all__, __builtins__, __cached__, __doc__, __file__, __initializing__, __loader__, __name__, __package__, _disassemble_bytes, _disassemble_str, _format_code_info, _have_code, _test, _try_compile, cmp_op, code_info, dis, disassemble, disco, distb, findlabels, findlinestarts, hascompare, hasconst, hasfree, hasjabs, hasjrel, haslocal, hasname, hasnargs, opmap, opname, pretty_flags, show_code, sys, types
    output = []
    def out(obj):
        output.append(str(obj))
    code = co.co_code
    labels = findlabels(code)
    linestarts = dict(findlinestarts(co))
    n = len(code)
    i = 0
    extended_arg = 0
    free = None
    while i < n:
        op = code[i]
        if i in linestarts:
            if i > 0:
                out('\n')
            out("%3d" % linestarts[i])
        else:
            out('   ')
        if i == lasti: out('-->')
        else: out('   ')
        if i in labels: out('>>')
        else: out('  ')
        out(repr(i).rjust(4))
        out(opname[op].ljust(20))
        i = i+1
        if op >= HAVE_ARGUMENT:
            oparg = code[i] + code[i+1]*256 + extended_arg
            extended_arg = 0
            i = i+2
            if op == EXTENDED_ARG:
                extended_arg = oparg*65536
            out(repr(oparg).rjust(5))
            if op in hasconst:
                out('(' + repr(co.co_consts[oparg]) + ')')
            elif op in hasname:
                out('(' + co.co_names[oparg] + ')')
            elif op in hasjrel:
                out('(to ' + repr(i + oparg) + ')')
            elif op in haslocal:
                out('(' + co.co_varnames[oparg] + ')')
            elif op in hascompare:
                out('(' + cmp_op[oparg] + ')')
            elif op in hasfree:
                if free is None:
                    free = co.co_cellvars + co.co_freevars
                out('(' + free[oparg] + ')')
            elif op in hasnargs:
                out('(%d positional, %d keyword pair)'
                      % (code[i-2], code[i-1]))
        out('\n')
    return ''.join(output)