sys.exit() not working in python repl?

Hi all, I am not sure if this is a problem with or I am just coding the python wrong. My simple code to open a file is:

file_in = open ('data_file', 'r')
print ("Could not open data_file for reading.")
print ("Why doesn't this exit work?")

All is well if data_file exists but if not, we go to the except where it does a print and should exit. But the program hangs there until I press Stop. The 2nd print statement does not occur either so it looks like it goes into exit() but does not come out?

Ideas? Thanks.

Edit to original question: I see the whitespace indentation got lost when I submitted the question but it is correct in the real code.

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@timmy_i_chen Thanks for the reply. I don't really understand why repl makes this distinction between "eval mode" and "project mode" and basing that on having 1 file or more than 1 file? And furthermore, you have limited capabilities unless you add a 2nd file? This seems like a bad idea... :-) Because now if I want exit() to get me back to the repl command prompt I have to add a 2nd file that I don't need in this case?