##sys.exc_info() 返回 (type, value, traceback). type为异常类型, value为异常的参数(通常为异常错误的信息), traceback为跟踪回溯的对象.
exc_type, exc_value, exc_traceback = sys.exc_info()print “*** print sys.exc_info:”print ‘exc_type is: %s, exc_value is: %s, exc_traceback is: %s’ % (exc_type, exc_value, exc_traceback)
输出:
*** print sys.exc_info:exc_type range, exc_traceback is: <traceback object at 0x7fee3b00eb48>traceback.print_tb(traceback[, limit[, file]])
打印栈的跟踪信息. 如果省略limit, 将打印所有跟踪入口信息. file默认为std.err.
print “*** print_tb:”traceback.print_tb(exc_traceback, limit=1, file=sys.stdout)
输出:
*** , line 13, in <module>mock()traceback.print_exception(type, value, traceback[, limit[, file]])
打印异常信息. (type, value, traceback)为sys.exc_info()返回的元组.和print_tb不同的是: – 如果traceback不为空, 打印栈头信息(即最近被调用的信息). – 在栈的信息后打印异常类型和常的参数. – 如果是语法错误, 会打印对应的代码行数, 用”^”指明语法错误的位置.
print “*** print_exception:”traceback.print_exception(exc_type, exc_value, exc_traceback, limit=2, file=sys.stdout)
输出:
*** print_exception:Traceback (most recent call last): File “t.py”, line 13, in <module>mock() File “t.py”, line 4, in mocklumberjack()IndexError: tuple index traceback.print_exc([limit[, file]])
print_exception(sys.exc_type, sys.exc_value, sys.exc_traceback, limit, file)的简写.
print “*** print_exc:”traceback.print_exc()
输出:
*** print_exc:Traceback (most recent call last): File “t.py”, line 13, in <module>mock() File “t.py”, line 4, in mocklumberjack() File “t.py”, line 7, in lumberjackbright_side_of_death() File “t.py”, line 10, in bright_side_of_deathreturn tuple()[1]IndexError: tuple index traceback.format_exc([limit])
类似于print_exc(limit), 但是返回字符串而不是输出到file.
print “*** format_exc, first and last line:”formatted_lines = traceback.format_exc().splitlines()print formatted_lines[0]print formatted_lines[-1]
输出:
*** format_exc, :Traceback (most recent call last):IndexError: tuple index out of rangetraceback.format_exception(type, value, tb[, limit])
格式化栈信息和异常信息. 返回一个列表, 包括代码文件和代码行, 以及异常信息.
repr(traceback.format_exception(exc_type, exc_value, exc_traceback))
输出:
[‘Traceback (most recent call last):\n’, ‘ File “t.py”, line 13, in <module>\n mock()\n’, ‘ File “t.py”, line 10, in mock\n lumberjack()\n’, ‘ File “t.py”, line 4, in lumberjack\n bright_side_of_death()\n’, ‘ File “t.py”, line 7, in bright_side_of_death\n return tuple()[0]\n’, ‘IndexError: tuple index out of range\n’]traceback.extract_tb(traceback[, limit])
返回一个跟踪对象(traceback)的元组列表. 元组内容为(filename, line number, function name, text).
repr(traceback.extract_tb(exc_traceback))
输出:
[(‘t.py’, 13, ‘<module>’, ‘mock()’), (‘t.py’, 4, ‘mock’, ‘lumberjack()’), (‘t.py’, 7, ‘lumberjack’, ‘bright_side_of_death()’), (‘t.py’, 10, ‘bright_side_of_death’, ‘return tuple()[1]’)]traceback.extract_stack([f[, limit]])
返回当前栈帧的原始跟踪(traceback)对象的信息, 格式和extract_tb一样, 元组内容为(filename, line number, function name, text).
traceback.extract_stack()
输出:
*** extract_stack:[(‘t.py’, 47, ‘<module>’, ‘print traceback.extract_stack()’)]traceback.format_list(list)
按照list对应的项, 返回一个元组列表, 形式为同extract_tb()或者extract_stack()返回的一样. 元组内容为(filename, line number, function name, text) 将extract_tb()或者extract_stack()返回的list进行格式化.
print traceback.format_list([(‘spam.py’, 3, ‘<module>’, ‘spam.eggs()’), (‘eggs.py’, 42, ‘eggs’, ‘return “bacon”‘)])
输出:
[‘ File “spam.py”, line 3, in <module>\n spam.eggs()\n’, ‘ File “eggs.py”, line 42, in eggs\n return “bacon”\n’]traceback.format_tb(tb[, limit])
format_list(extract_tb(tb, limit))的简写.
traceback.format_stack([f[, limit]])
format_list(extract_stack(f, limit))的简写
traceback.tb_lineno(tb)而在于当时的那份心情。可是旅行的彼时那刻我的心情一直是好的吗？
