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I'm not sure if I can help since I have 2.7.3 what kinds of messages are you getting?
IDLE Subprocess Error" at the top and then "Socket Error: Conection refused". Right after that a second box popped up which the title said "Subprocess Startup Error" it said underneath "IDLE's subprocess didn't make connection. Either IDLE can't start a subprocess or a personal firewall software is blocking the connection.
do I absolutely need that particular version?
I'm not sure what exactly the problem is, but if you don't have a good antivirus and are on a windows, you computer may be flagging IDLE as a security risk. If you have a mac or Norton antivirus that is probably not the problem though. Best let someone more tech-savvy than me answer.
I use AVG and have checked of my firewalls to make sure it wasn't being blocked.
what course are you doing? i think both OCW and EDX use the 2.7.3 so you could try to install that instead or just try to reinstall the one you have
MIT 6.00 Intro Comp sci. I just got my version working again. Thanx for all the advice guys.
The problem you are mentioning is not due to your version of Python. It is due to the loopback interface 127.0.0.1 not being unavailable. It might be blocked by your firewall or your network interfaces might be misconfigured. What OS are you using?
edit: "...loopback interface 127.0.0.1 not being AVAILABLE." (typo)
Recommend a reinstall of Python 2.5.4, then reboot the machine.