Jimmie He wrote: >> What shell are you using? The one provided by Idle? > > Yes. I use IDLE,the python version is 3.3.1.What else could I use??
The shell provided by the operating system is usually much faster. When I modify your code to import binascii def read_bmp(): f = open('example.bmp','rb') rawdata = f.read() #f.read(1000) is ok hexstr = binascii.b2a_hex(rawdata) #Get an HEX number bsstr = bin (int(hexstr,16))[2:] f.close() print('bin: ',bsstr,type(bsstr)) return if __name__ == "__main__": read_bmp() and generate a dummy example.bmp with 2**20 (about 1 million) bytes it takes about 2 seconds to terminate -- on hardware that is quite old. If I redirect the output it is even faster: $ time python3 bmp_to_bin.py > /dev/null real 0m0.766s user 0m0.300s sys 0m0.180s I am a Linux user, but expect similar numbers on Windows (in the DOS box or one of its successors). I have considered filing a bug* to ask for a tweak in idle that improves its responsiveness, but first wanted you to confirm that this was indeed the problem. (*) on http://bugs.python.org, if you want to do it yourself -- http://mail.python.org/mailman/listinfo/python-list