Converting a float variable to string

Question

I'm trying to convert a variable whose value changes however the value is usually to one decimal place e.g. 0.5. I'm trying to change this variable to 0.50. I'm using this code but when I run the program it says TypeError: Can't convert 'float' object to str implicitly

Here is my code:

while topup == 2:
    credit = credit + 0.5
    credit = str(credit)
    credit = '%.2f' % credit
    print("You now have this much credit £", credit)
    vending(credit)

That's not the error I'm getting. What version of Python are you using? — Kevin
– Kevin, Commented Oct 9, 2014 at 17:45
The error is actually that you're passing a string in '%.2f' % credit TypeError: a float is required for python 3 and TypeError: float argument required, not str for python 2. — Lewis Diamond
– Lewis Diamond, Commented Oct 9, 2014 at 17:49
@IsaacGSivaa Not a duplicate, though the OP might notice that as well. — JasonMArcher
– JasonMArcher, Commented Oct 9, 2014 at 21:06

Joran Beasley · Accepted Answer · 2014-10-09 17:54:21Z

1

while topup == 2:
    credit = float(credit) + 0.5
    credit = '%.2f' % credit
    print("You now have this much credit £", credit)
    vending(credit)

the problem is you cannot float format a string

"%0.2f"%"3.45"  # raises error

instead it expects a number

"%0.2f"%3.45   # 0k
"%0.2f"%5   # also ok

so when you call str(credit) it breaks the format string right below (that incidentally also casts credit back to a string)

incidentally you should really only do this when you print

credit = 1234.3
print("You Have : £%0.2f"%credit)

in general you want your credit to be a numeric type so that you can do math with it

edited Oct 9, 2014 at 17:54

answered Oct 9, 2014 at 17:45

Joran Beasley

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1 Comment

NoobProgrammer Over a year ago

Is there anyway I can solve my problem any other way by not using str(credit)?

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