我们从Python开源项目中，提取了以下12个代码示例，用于说明如何使用dis.py()。
def __init__(self, text, code=None, filename=None): self.text = text if code: self.code = code else: try: self.code = compile_unicode(text, filename, "exec") except SyntaxError as synerr: raise NotPython( u"Couldn't parse '%s' as Python source: '%s' at line %d" % ( filename, synerr.msg, synerr.lineno ) ) # Alternative Python implementations don't always provide all the # attributes on code objects that we need to do the analysis. for attr in ['co_lnotab', 'co_firstlineno', 'co_consts', 'co_code']: if not hasattr(self.code, attr): raise CoverageException( "This implementation of Python doesn't support code analysis.\n" "Run coverage.py under CPython for this command." )
def __init__(self, code=None, text=None, filename=None): if code: self.code = code self.text = text else: if not text: assert filename, "If no code or text, need a filename" sourcef = open_source(filename) try: text = sourcef.read() finally: sourcef.close() self.text = text try: # Python 2.3 and 2.4 don't like partial last lines, so be sure # the text ends nicely for them. self.code = compile(text + '\n', filename, "exec") except SyntaxError: _, synerr, _ = sys.exc_info() raise NotPython( "Couldn't parse '%s' as Python source: '%s' at line %d" % (filename, synerr.msg, synerr.lineno) ) # Alternative Python implementations don't always provide all the # attributes on code objects that we need to do the analysis. for attr in ['co_lnotab', 'co_firstlineno', 'co_consts', 'co_code']: if not hasattr(self.code, attr): raise CoverageException( "This implementation of Python doesn't support code " "analysis.\n" "Run coverage.py under CPython for this command." )
def _bytes_lines(self): """Map byte offsets to line numbers in `code`. Uses co_lnotab described in Python/compile.c to map byte offsets to line numbers. Produces a sequence: (b0, l0), (b1, l1), ... Only byte offsets that correspond to line numbers are included in the results. """ # Adapted from dis.py in the standard library. byte_increments = bytes_to_ints(self.code.co_lnotab[0::2]) line_increments = bytes_to_ints(self.code.co_lnotab[1::2]) last_line_num = None line_num = self.code.co_firstlineno byte_num = 0 for byte_incr, line_incr in zip(byte_increments, line_increments): if byte_incr: if line_num != last_line_num: yield (byte_num, line_num) last_line_num = line_num byte_num += byte_incr line_num += line_incr if line_num != last_line_num: yield (byte_num, line_num)
