KeyboardInterrupt close failed in file object destructor: sys.excepthook is missing lost sys.stderr

[Jai]

Code
#################################

#!/usr/bin/env python 


import sys, re 




def find_position(line):
    pun = ""
    if re.search(r"[.?!]+", line):
        pun = re.search(r"[.?!]+", line).group()
    pos = line.find(pun)
    pos = pos+len(pun)-1
    return pos




def sentence_splitter(filename):

    f = open(filename, "r")

    for line in f:
        line = line.strip()
        print line + "\n"
        while line:
            pos  =  find_position(line)
            line2 = line[ : pos+1].split(" ")
            length = len(line2)
            last_word = line2[length -1]

        try:
                if re.search(r"[A-Z]+.*", last_word) or  line[pos+1] != " " or line[pos+2].islower() :
                print line[:pos+1],
                line = line[pos+1:]

            else:
            print line[ : pos+1]
                line = line[pos+1 :]


            except :
                print " error here!!"      

    f.close()        
    return " bye bye"





if __name__=="__main__":
    print sentence_splitter(sys.argv[1])


##########################3

exicution 

python sentence_splitter6.py  README  | more


###############

README

Mr. Smith bought example.cheapsite.com for 1.5 million dollars, i.e. he paid a lot for it. Did he mind? Adam Jones Jr. thinks he didn't. In any case, this isn't true... Well, with a probability of .9 it isn't. The result should be:
~                                                                                                  
############################


output

Mr. Smith bought example.cheapsite.com for 1.5 million dollars, i.e. he paid a lot for it. Did he mind? Adam Jones Jr. thinks he didn't.
 In any case, this isn't true... Well, with a probability of .9 it isn't. The result should be:

Mr.  Smith bought example. cheapsite. com for 1. 5 million dollars, i. e.  he paid a lot for it.
 Did he mind?
 Adam Jones Jr.  thinks he didn't.
 In any case, this isn't true...
 Well, with a probability of . 9 it isn't.

##########################################################3

error

KeyboardInterrupt
close failed in file object destructor:
sys.excepthook is missing
lost sys.stderr

##########################################


please help what is this i have try lot but unable to remove it