by raise statement, for example:
#! /usr/bin/python
import sys,os
try:
f = open('myfile.txt')
s = f.readline()
i = int(s.strip())
except IOError, (errno,strerror):
print "I/O error(%s): %s" %(errno,strerror)
except ValueError:
print "Could not convert data to an integer"
except:
print "Unexpected error:", sys.exec_info()[0]
raise
raise NameError, "Just for test! "
Get the result as blow:
D:\SVNtest>python test.py
Traceback (most recent call last):
File "test.py", line 17, in <module>
raise NameError, "Just for test! "
NameError: Just for test!