TypeError: Can't convert 'int' object to string implicity

Question

I can't figure out why I get the error: TypeError: Can't convert 'int' object to string implicity

This is the relevant code for the class:

class Pig():

def __init__(self, name, age, weight, value):
    self.name = name
    self.age = age
    self.weight = weight
    self.value = value

def runAndGainValue(self, value):
    self.value += value  #This is where the error occur.

def __str__(self):
    a = self.name + " "
    a += str(self.value) + " "
    return a

And here's the part of the code for the main program:

elif work == "2":
    yourfarm.printAnimals()
    print ("blablablabla")
    for pig in p:
        pig.runAndGainValue(5)
    yourfarm.printAnimals()

And I can't figure out why I get this error. I've tried searching for it but I am new with programming so I have a lot of trouble with interpreting a totally different code but with the same problem. Very much grateful for your help ahead.

is self.name a string, or are you passing in a number when you create the Pig object? — Owen
– Owen, Commented Nov 3, 2013 at 23:13
Ops sry, I've edited the question and commented where the error occur. — Bondenn
– Bondenn, Commented Nov 3, 2013 at 23:14
I'm not sure what you mean because I'm a superbeginner. But the self.name is decided in my class for the farm. with for i in self.animals: print(i.name,i.weight, and so on). — Bondenn
– Bondenn, Commented Nov 3, 2013 at 23:15

Martijn Pieters · Accepted Answer · 2013-11-03 23:14:36Z

2

You have set the value of your pig to a string, then when you call pig.runAndGainValue(5) you are trying to add an integer to a string:

def runAndGainValue(self, value):
    self.value += value

This raises an exception as Python strings are not implicitly converted to numbers, even when their value could be interpreted as a number:

>>> '10' + 5
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: Can't convert 'int' object to str implicitly

When creating the Pig, make sure value in an integer, always. Perhaps you need to explicitly convert in the initializer:

def __init__(self, name, age, weight, value):
    self.name = name
    self.age = int(age)
    self.weight = int(weight)
    self.value = int(value)

or just make sure your inputs are integers.

answered Nov 3, 2013 at 23:14

Martijn Pieters

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7 Comments

Bondenn Over a year ago

I see. That brings me a new problem, because of how I've decided the age, weight, and value in my main code. I wrote it like Pig("bla the pig", "age: 2", "weight: 50" if you understand what I mean.

Martijn Pieters Over a year ago

@Bondenn: You cannot do that; let the attribute names themselves determine what the value means, don't store strings with added metadata like that.

Martijn Pieters Over a year ago

@Bondenn: At least, parse out the value: self.age = int(age.rsplit(':', 1)[-1]) would get just the part of the string after the last : and turn that into an integer.

Bondenn Over a year ago

Okey that's my bad for being a beginner! But how do I do it when I want the attributes to be decided? For example: If you buy a pig it should be presented with, Name: Pig, Age: 2, Weight: 50kg and so on?

Martijn Pieters Over a year ago

@Bondenn: leave that to the printing code; take a look at the string format syntax to make that part easier.

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