python try语句如何打印错误行

打印当前.py文件错误行：

import sys

try:

        a = [1,2]

        print a[3]

except:

       
s=sys.exc_info()

        print "Error '%s' happened on line %d" %
(s[1],s[2].tb_lineno)

打印execfile的打印错误行：

try:

        execfile("tprint.py")

except Exception, info:

       
#print info[1]

        print "Error '%s' happened on line %d" %
(info[0], info[1][1])

利用反射机制，调用函数，打印被调用方的错误行及错误信息       

try:

        callfunc.callfunc(myklass,strmethod,params)

except :

        print '=== STEP ERROR INFO START'

        import traceback

        traceback.print_exc()

        print '=== STEP ERROR INFO END'