def cent_to_fahr(cent):
print (cent / 5.0 * 9 + 32)
print (cent_to_fahr(20))
The output is this :
68.0
None
Why this output has None?
I didn't get this result when I use just cent_to_fahr(20). Can I ask why it happens ?
2 Answers
To put it into context, let's try understand what causes each line of output you received:
68.0is printed thanks to the contents of your function. This could be seen as the "end" of that computation's "life", that value/result is no longer available for further computations.Noneis what the function returns, and in this case is also quite useless.
Now that we understand that better, I would recommend adjusting the function to return the value computed.
def cent_to_fahr(cent):
return (cent / 5.0 * 9 + 32)
That way when the function is called (in context of further functions) it will return a value that that can be further processed (in this case with print()):
>>>print(cent_to_fahr(20))
Which will print 68.0.
Comments
def cent_to_fahr(cent):
return (cent / 5.0 * 9 + 32)
print (cent_to_fahr(20))
a function needs to return a value to have an output other then None
2 Comments
Gingerbread
I didn't get this result when i use just cent_to_fahr(20).Can i ask why it happens ?
Whud
@Gingerbread think of return like just a number. If you call Cent_to_fahr(20) you get 68.0 if you say a = Cent_to_fahr(20). a is now 68.0. You need to print the number to see it. so print(Cent_to_fahr(20)) will print it but just doing Cent_to_fahr(20) will do nothing.
cent_to_fahrprints the result and the caller prints the return value of this function which isNone.printin the function which prints the calculated value.