TypeError: Can't convert 'int' object to str implicitly [duplicate]

Question

I am trying to write a text game and I have run into an error in the function I am defining that lets you basically spend your skill points after you make your character. At first, the error stated that I was attempting to subtract a string from an integer in this part of the code:balance - strength. Obviously that was wrong so I fixed it with strength = int(strength)... but now I am getting this error which I have never seen before(new programmer) and I am stumped on what exactly it is trying to tell me and how I fix it.

Here is my code for the part of the function that isn't working:

def attributeSelection():
    balance = 25
    print("Your SP balance is currently 25.")
    strength = input("How much SP do you want to put into strength?")
    strength = int(strength)
    balanceAfterStrength = balance - strength
    if balanceAfterStrength == 0:
        print("Your SP balance is now 0.")
        attributeConfirmation()
    elif strength < 0:
        print("That is an invalid input. Restarting attribute selection. Keep an eye on your balance this time!")
        attributeSelection()
    elif strength > balance:
        print("That is an invalid input. Restarting attribute selection. Keep an eye on your balance this time!")
        attributeSelection()
    elif balanceAfterStrength > 0 and balanceAfterStrength < 26:
        print("Ok. You're balance is now at " + balanceAfterStrength + " skill points.")
    else:
        print("That is an invalid input. Restarting attribute selection.")
        attributeSelection()

And here is the error I get when I get to this part of the code in the shell:

    Your SP balance is currently 25.
How much SP do you want to put into strength?5
Traceback (most recent call last):
  File "C:\Python32\APOCALYPSE GAME LIBRARY\apocalypseGame.py", line 205, in <module>
    gender()
  File "C:\Python32\APOCALYPSE GAME LIBRARY\apocalypseGame.py", line 22, in gender
    customizationMan()
  File "C:\Python32\APOCALYPSE GAME LIBRARY\apocalypseGame.py", line 54, in customizationMan
    characterConfirmation()
  File "C:\Python32\APOCALYPSE GAME LIBRARY\apocalypseGame.py", line 93, in characterConfirmation
    characterConfirmation()
  File "C:\Python32\APOCALYPSE GAME LIBRARY\apocalypseGame.py", line 85, in characterConfirmation
    attributeSelection()
  File "C:\Python32\APOCALYPSE GAME LIBRARY\apocalypseGame.py", line 143, in attributeSelection
    print("Ok. You're balance is now at " + balanceAfterStrength + " skill points.")
TypeError: Can't convert 'int' object to str implicitly

Does anyone know how to solve this? Thanks ahead.

Moreen

You must do str(balanceAfterStrength) because one of Python's mottos is "Explicit is better than Implicit" – Deaver

I know this is completely irrelevant to the problem, but that strength > balance check after subtracting from balance means you can only spend up to half your balance on strength. Is that intentional, or a bug? (And, while I'm picking irrelevant nits, "Ok. Your balance is now "—"Your" not "You're", and you don't need the "at".) – Toque

I know there are a lot of problems with it, I still have a lot of debugging to do. – Moreen

Answer 1

You cannot concatenate a string with an int. You would need to convert your int to a string using the str function, or use formatting to format your output.

Change: -

print("Ok. Your balance is now at " + balanceAfterStrength + " skill points.")

to: -

print("Ok. Your balance is now at {} skill points.".format(balanceAfterStrength))

or: -

print("Ok. Your balance is now at " + str(balanceAfterStrength) + " skill points.")

or as per the comment, use , to pass different strings to your print function, rather than concatenating using +: -

print("Ok. Your balance is now at ", balanceAfterStrength, " skill points.")

Photochromy

Or, instead of trying to add, print("Ok. You're balance is now at", str, "skill points"). – Toque

@abarnert.. Yeah, that is better than +. – Photochromy

But as your edit is written, it's misleading. You cannot use , to concatenate strings; you can use , to separate arguments to print, which will be printed one by one, with spaces between them. – Toque

Ok, I am going to change my code to the last format you suggested Rohit. Thanks for the help! – Moreen

@abarnert. Oh. Is it like that? I thought , is also used for concatenation in Python. – Photochromy

No, , is not used for concatenation in Python, just for separating function arguments (and tuple members and various other things). In fact, of the reasons that Python 3 has a print function instead of a print statement like Python 2 was that the magical behavior of , in print used to mislead people in exactly that way. – Toque

@abarnert. Ok. I got to know something new today. Thanks :) And yes, since I use Python 2, I too might have been misleaded there. ;) – Photochromy

One last point: the , does not require str(balance); that's the whole reason I suggested it. The print function can print any type, including int, so if you make the string and integer values separate parameters, you don't need to convert everything into strings. Also, print automatically adds spaces, so you don't want to add those extra spaces yourself. Finally, in Python 2, you need to remove the parentheses, because it'll end up printing a tuple (with explicit parentheses and commas). – Toque

Oh, one more question, sorry to ask so late. Is it possible for me to change the string to an integer rather than the integer to a string? – Moreen

In short: print "Ok. You're balance is now at", balanceAfterStrength, "skill points." for Python 2, or print("Ok. You're balance is now at", balanceAfterStrength, "skill points.") for Python 3. – Toque

@TylerHaddaway.. Of course you can't convert "abc" to an integer. But yes, you can sure convert "12" to intege using int("12"). – Photochromy

@RohitJain: Actually, you can convert "abc" to an integer in any base > 12: int("abc", 16) is 2748. But you probably don't actually want to convert "abc" to an integer if you didn't already know that, so your answer is good. – Toque

Yeah, I don't plan to turn letters into a number anytime soon, lol. – Moreen

@abarnert.. Aww! I'm stumped with that. Well, I'm not surprised, because I have still much to learn in Python. Just a beginner in it. ;) – Photochromy

Answer 2

def attributeSelection():
balance = 25
print("Your SP balance is currently 25.")
strength = input("How much SP do you want to put into strength?")
balanceAfterStrength = balance - int(strength)
if balanceAfterStrength == 0:
    print("Your SP balance is now 0.")
    attributeConfirmation()
elif strength < 0:
    print("That is an invalid input. Restarting attribute selection. Keep an eye on your balance this time!")
    attributeSelection()
elif strength > balance:
    print("That is an invalid input. Restarting attribute selection. Keep an eye on your balance this time!")
    attributeSelection()
elif balanceAfterStrength > 0 and balanceAfterStrength < 26:
    print("Ok. You're balance is now at " + str(balanceAfterStrength) + " skill points.")
else:
    print("That is an invalid input. Restarting attribute selection.")
    attributeSelection()

Landside