NZEC error in JAVAC (Python)

[syogi]

Hello Admin,
I submitted JAVAC problem in Python and it returned NZEC error. submission id is 815295. Could someone please tell me whts the problem

[noix]

Hello Admin,
I submitted JAVAC problem in Python and it returned NZEC error. submission id is 815295. Could someone please tell me whts the problem

Traceback (most recent call last):
  File "/sources/tested.py", line 69, in <module>
  File "/sources/tested.py", line 21, in main
EOFError: EOF when reading a line

[syogi]

Hi noix,
thanks for the reply.. It seems like end of file is reached..
I do not know how online judge executes the programs.
can you show some code snippet that how to detect that input is ended in python or avoid EOFError.
I tested my program with all the test cases from actual competition where this problem appeared and it passed all the cases.

In my main method I am doing this. Plese tell me where I am wrong :

def main():

str = raw_input()
while(str):
        if(str.find('_') != -1):
            if(checkValidCPPIdent(str)):
                str = convertCPPtoJava(str)
                print str           
            else:
                print 'Error!'   

        else:
            if(checkValidJavaIdent(str)):
                str = convertJavatoCPP(str)
                print str            
            else:
                print 'Error!'

        str = raw_input()

//helper methods
//call to main()

[nneonneo]

Easiest way:
try: str=raw_input()
except EOFError: break

[syogi]

thanks for that...