python中沒辦法直接取得當前的行號和函數名。這是有人在論壇里提出的問題，底下一群人只是在猜測python為什么不像__file__一樣提供__line__和__func__，但是卻最終也沒有找到解決方案。

%(name)s Name of the logger (logging channel)

%(levelno)s Numeric logging level for the message (DEBUG, INFO, WARNING, ERROR, CRITICAL)

%(levelname)s Text logging level for the message ("DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL")

%(pathname)s Full pathname of the source file where the logging call was issued (if available)

%(filename)s Filename portion of pathname

%(module)s Module (name portion of filename)

%(lineno)d Source line number where the logging call was issued (if available)

%(funcName)s Function name

%(created)f Time when the LogRecord was created (time.time() return value)

%(asctime)s Textual time when the LogRecord was created

%(msecs)d Millisecond portion of the creation time

%(relativeCreated)d Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded (typically at application startup time)

%(thread)d Thread ID (if available)

%(threadName)s Thread name (if available)

%(process)d Process ID (if available)

%(message)s The result of record.getMessage(), computed just as the record is emitted

也就是說，logging是能夠獲取到調用者的行號和函數名的，那會不會也可以獲取到自己的行號和函數名呢？

def currentframe():

"""Return the frame object for the caller's stack frame."""

try:

raise Exception

except:

return sys.exc_info()[2].tb_frame.f_back

def findCaller(self):

"""

Find the stack frame of the caller so that we can note the source

file name, line number and function name.

"""

f = currentframe()

#On some versions of IronPython, currentframe() returns None if

#IronPython isn't run with -X:Frames.

if f is not None:

f = f.f_back

rv = "(unknown file)", 0, "(unknown function)"

while hasattr(f, "f_code"):

co = f.f_code

filename = os.path.normcase(co.co_filename)

if filename == _srcfile:

f = f.f_back

continue

rv = (co.co_filename, f.f_lineno, co.co_name)

break

return rv

def _log(self, level, msg, args, exc_info=None, extra=None):

"""

Low-level logging routine which creates a LogRecord and then calls

all the handlers of this logger to handle the record.

"""

if _srcfile:

#IronPython doesn't track Python frames, so findCaller throws an

#exception on some versions of IronPython. We trap it here so that

#IronPython can use logging.

try:

fn, lno, func = self.findCaller()

except ValueError:

fn, lno, func = "(unknown file)", 0, "(unknown function)"

else:

fn, lno, func = "(unknown file)", 0, "(unknown function)"

if exc_info:

if not isinstance(exc_info, tuple):

exc_info = sys.exc_info()

record = self.makeRecord(self.name, level, fn, lno, msg, args, exc_info, func, extra)

self.handle(record)

實際上是通過在currentframe函數中拋出一個異常，然后通過向上查找的方式，找到調用的信息。其中

rv = (co.co_filename, f.f_lineno, co.co_name)

的三個值分別為文件名，行號，函數名。(可以去http://docs.python.org/library/sys.html來看一下代碼中幾個系統函數的說明)

OK，如果已經看懂了源碼，那獲取當前位置的行號和函數名相信也非常清楚了，代碼如下:

#!/usr/bin/python

# -*- coding: utf-8 -*-

# Description: 獲取當前位置的行號和函數名

import sys

def get_cur_info():

"""Return the frame object for the caller's stack frame."""

try:

raise Exception

except:

f = sys.exc_info()[2].tb_frame.f_back

return (f.f_code.co_name, f.f_lineno)

def callfunc():

print get_cur_info()

if __name__ == '__main__':

callfunc()

輸入結果是:

('callfunc', 24)

符合預期~~

哈哈，OK！現在應該不用再抱怨取不到行號和函數名了吧~

=============================================================================

后來發現，其實也可以有更簡單的方法，如下:

import sys

def get_cur_info():

print sys._getframe().f_code.co_name

print sys._getframe().f_back.f_code.co_name

get_cur_info()

調用結果是:

get_cur_info

總結

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