"Can't convert 'float' object to str implicitly"

Question

>>> def main():
        fahrenheit = eval(input("Enter the value for F: "))
        celsius = fahrenheit - 32 * 5/9
        print("The value from Fahrenheit to Celsius is " + celsius)
>>> main()
Enter the value for F: 32
Traceback (most recent call last):  
  File "<pyshell#73>", line 1, in <module>
    main()
  File "<pyshell#72>", line 4, in main
    print("The value from Fahrenheit to Celsius is " + celsius)
TypeError: Can't convert 'float' object to str implicitly

**Do not ever use `eval` for data that could possibly ever come from user input. It is a critical security risk that allows the user to run arbitrary code on your computer.** — Karl Knechtel, Jul 27 '22 at 03:16

score 21 · Accepted Answer · edited Mar 14 '14 at 06:02

21

floats can't be implicitly converted into strings. You need to do it explicitly.

print("The value from Fahrenheit to Celsius is " + str(celsius))

But it's better to use format.

print("The value from Fahrenheit to Celsius is {0}".format(celsius))

edited Mar 14 '14 at 06:02

Tim Pietzcker

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answered Mar 14 '14 at 06:00

Jayanth Koushik

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1

If you're using Python 2.7+ you can omit the positional argument specifiers in `str.format`, so `{0}` is equivalent to `{}` – Paolo Moretti Mar 14 '14 at 06:08
_"But it's better to use `format`."_ Can you explain why? – Joshua Pinter Dec 17 '21 at 18:17

score 0 · Answer 2 · answered Mar 14 '14 at 05:59

0

As the error says, you cannot covert float object to string implicitly. You have to do :

print("The value from Fahrenheit to Celsius is " + str(celsius))

answered Mar 14 '14 at 05:59

jester

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"Can't convert 'float' object to str implicitly"

2 Answers2

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