<human>: I recently purchased a one way ticket from New York to Prague a couple of weeks ago.  I am teaching English there for a week and then buying a cheap flight to Venice where I will spend the next 3-5 weeks traveling around by train/boat throughout Italy, South France and possibly Tunisia (if the price is right).  

Some people (Mom) are telling me that since I have not purchased a return flight yet, that customs will give me a hard time and possibly not let me into Europe in the first place.  The flight to Prague has a connection in London which only has a 1 hour and 20 minute wait in between flights.  Can I kiss this connection flight goodbye?

My plan is to buy a return ticket when I ~~am finished traveling~~ run out of money.  I would make my way to the closest major city, probably Rome, and leave from there.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Will I get hassled entering Europe with a one way ticket.  If so, what options can I take if I am uncertain about the date of the return flight?