Hi i am a beginner who is learning Python, i have stumbled across this example in a book and for some reason when i attempt the same code myself i am not receiving the same output? Please help...
def tester(start):
state = start
def nested(label):
nonlocal state
print(label, state)
state += 1
return nested
>>> F = tester(0)
>>> F('spam')
spam 0
>>> F('ham')
ham 1
>>> F('eggs')
eggs 2
My results are not incrementing + 1 each time i run the function, is there something wrong with the book?
Eric
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asked Jun 11, 2012 at 10:41
thechrishaddad
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2 Answers 2
Works for me. Are you sure you're using python 3? nonlocal is a python 3 feature, and will not work in python 2.x.
answered Jun 11, 2012 at 10:45
Eric
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3 Comments
thechrishaddad
How do you know if you are using python 3? i just run python interactively in my terminal by typing 'python'? or do you need to run it differently for python 3? i do have python 3.2 installed.
Christian Witts
@user1265535: When you open up your Python Terminal, the first line has the version listed for eg.
Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)] on win32thechrishaddad
yeah okay my bad it works in terminal now which is weird Thanks :)
https://stackoverflow.com/a/1261961/778858 sums it up. Basically python changed a lot from 2.~ to 3.0>= and you end up with issues like this. Compare what it says at the start of the book with the version they are using and compare it to your own.
answered Jun 11, 2012 at 10:45
jett
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Comments
lang-py
nonlocal state). Anyway I tried it in terminal, it works fine to me.