On 10/03/13 19:57, Vincent Balmori wrote:
I am trying to use a __str__ method to display the values of attribute mood =
self.hunger + self. boredom.
When I try to execute I get this error:
Traceback (most recent call last):
File "C:/Users/Vincent/Documents/Programming Tutorials/Python Programming for the
Absolute Beginner - Project Files/source/chapter08/critter_caretaker_vpb3.py", line 105,
in <module>
main()
File "C:/Users/Vincent/Documents/Programming Tutorials/Python Programming for the
Absolute Beginner - Project Files/source/chapter08/critter_caretaker_vpb3.py", line
99, in main
print(crit)
TypeError: __str__ returned non-string (type int)
This is the code:
[snip code]
You haven't actually asked a question here, so I don't understand what is
giving you trouble. I'll try to guess, but please pardon me if I guess wrongly.
Have you read the error message Python gives?
__str__ returned non-string (type int)
This tells you that if __str__ returns something which is not a string, Python
will treat it as an error. To fix that, change your __str__ method to return a
string. Use the str() function to convert a non-string value into a string.
Is the error message not clear enough? If not, can you suggest an improvement?
Your __str__ method looks like this:
def __str__(self):
mood = self.boredom + self.hunger
return mood
This is not a very good design for a __str__ function. str(some_critter) should
return something that indicates to the reader that it is a Critter, not an
integer. That is, something like one of these might be appropriate:
Critter(name="Fred", boredom=7, hunger=5)
<Critter object at 0xb7f744f0>
<frustrated Critter "Fred">
or similar, rather than:
12
which does not look like a Critter nor give the reader any hint at all that
what they are seeing is a Critter.
--
Steven
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