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beginner question about a code for converting inch(es) to cm

Hi, I have just started learning Python and am a total newbie. Besides SoloLearn I am using a book designed for beginners which came with a CD with an IDLE on it. I am already having problems with the 3rd exercise, which is to write a code for converting inch(es) to cm. inch=2.54 print("Please enter a value for inch.") xi=float(input()) xcm=xi*inch print(xi, "inch(es) equal", xcm, "cm") playground: https://code.sololearn.com/c7D39UG6OhIF The code seems to work in playground. It is also the sample solution given in the book (keep in mind, this is the very start of the book...). I had to look up the sample solution because I kept getting errors when creating own codes in the IDLE. Unfortunately, even the sample solution does not work in the IDLE: Traceback (most recent call last): File "<pyshell#2>", line 1, in <module> xi=float(input()) ValueError: could not convert string to float: As the code works with playground, I am thinking that something is wrong with the IDLE. I hope you guys can help me.

5/11/2019 10:44:31 AM

Julian

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Julian The program you have written at codeplayground is correct. It's just that sololearn's input mechanism is different. IDLE is a shell so it will evaluate line by line. And you can enter any number either in IDLE or sololearn. To fully run the code offline you need to create a source file like you did it here. Then compile and run it from command line/terminal like > python inch_to_cms.py or from with in the IDE (editor+compiler) I think python installer comes with simple IDE from within which you can run your program

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maybe you entered a number with a comma instead of a dot?

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Julian Check the input again (probably you entered comma instead of dot), it's working fine in IDLE

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Julian output from IDLE (from pydroid android app) >>> inch=2.54 >>> print("Please enter a value for inch.")Please enter a value for inch. >>> xi=float(input()) 2 >>> xcm=xi*inch >>> print(xi, "inch(es) equal", xcm, "cm") 2.0 inch(es) equal 5.08 cm >>>

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Julian after >>> xi = float(input()) when you press enter you need to enter a value like 2. If you press enter it will be taken as empty string and you will get conversion error

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Thank you so much ~ swim ~ and Игорь Яковенко for the fast answers :) Now it all makes sense and I can continue :)

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>>> inch=2.54 >>> print("Please enter a value for inch.") Please enter a value for inch. >>> xi=float(input()) Traceback (most recent call last): File "<pyshell#2>", line 1, in <module> xi=float(input()) ValueError: could not convert string to float: >>> This is the complete code until receiving an error message in the IDLE. To me it seems to be the exact same I entered in playground... Although playground does not have (or display) ">>>". In playground, I only had to press enter key once, in the IDLE i had to use it twice to get the next ">>>". P.S.: I do not know the different terms yet, sry.

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Oh, I see, this works. But how can I write the full code (https://code.sololearn.com/c7D39UG6OhIF) without having to enter a number? I want to be able to enter any number after it is finished. By entering a number while writing the code, it is fix, isn´t it?