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It says that it can't assign the operator. Why doesn't this work?

print ("Welkom")
print ("Voer het huidige bedrag op uw rekening in")
currentbank = input ("huidige bedrag:€")
print ("Hoeveel wil je erafhalen")
minusbank = input ("min:€")
print ("Je hebt als je dit doet:")
afterbank = false 
afterbank = currentbank - minusbank
print ("Dankjewel dat je dit programma gebruikt hebt")

"afterbank = currentbank - minusbank" has this error:

TypeError: unsupported operand type(s) for -: 'str' and 'str'

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    Please do include the full traceback when you have a problem. Commented Nov 13, 2013 at 13:22
  • 1
    currentbank-minusbank=afterbank What are you trying to do here? My guess is you wanted to do afterbank=currentbank-minusbank, and then afterbank=False is not needed at all. But I may be wrong. Commented Nov 13, 2013 at 13:25

3 Answers 3

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false should be spelled False (capital F).

The intent behind currentbank-minusbank=afterbank is unclear to me, but it is not valid code.

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Two things:

afterbank=false

You should spell it as False. In Python True and False are spelled with capitals.

The following line also won't work (it's incorrect):

currentbank-minusbank=afterbank

I think you meant:

afterbank = currentbank - minusbank

which means you subtract minusbank from currentbank and you store the result in afterbank.

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You are trying to use assignment on an expression:

currentbank-minusbank=afterbank

This doesn't work; there is no name to assign to here. Perhaps you wanted to test for equality here?

currentbank - minusbank == afterbank

Now you have a valid expression, but the result (True or False) is ignored.

Your editor is also showing that you are using a name you didn't define; false is seen as a name, not the value False, so it is warning you that a NameError will likely be raised there.

I think you wanted to show the result of the sum:

afterbank = currentbank - minusbank
print("Nu heb je", afterbank, "over")
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