overview for Bronco1676

On this deserted island I could use some help() in c/programmerhumor@lemmy.ml

[–] Bronco1676@lemmy.ml 17 points 11 months ago (2 children)

If you have a variable called exit you've overwritten the function in that scope, and won't be able to execute it.

e.g.

>>> exit=1
>>> exit()
Traceback (most recent call last):
  File "", line 1, in 
TypeError: 'int' object is not callable
>>>

On this deserted island I could use some help() in c/programmerhumor@lemmy.ml

[–] Bronco1676@lemmy.ml 7 points 11 months ago* (last edited 11 months ago)

This is the code (Github link):

class Quitter(object):
    def __init__(self, name, eof):
        self.name = name
        self.eof = eof
    def __repr__(self):
        return 'Use %s() or %s to exit' % (self.name, self.eof)
    def __call__(self, code=None):
        # Shells like IDLE catch the SystemExit, but listen when their
        # stdin wrapper is closed.
        try:
            sys.stdin.close()
        except:
            pass
        raise SystemExit(code)

What happens is that the python repl calls __repr__ automatically on each variable/statement that you type into the repl (except assignments e.g. x = 1). But this basically only happens in the repl. So "executing" only exit wouldn't work in a python script as it is not calling __repr__ automatically, so better you learn how to do it right than using just exit in your python scripts and scratching your head why it works in the repl but not in your code.