On 05/01/2019 16:18, David Lynch wrote: > Hello, > I'm not sure if this is where I can find this sort of help but I am > struggling understanding functions. I have written a simple math code but I > feel like it could be improved if I were to use it in a function.
You arein the right place and you have the right idea. You might find my tutorial on functions worth looking at: http://www.alan-g.me.uk/l2p2/tutfunc.htm But for the short version keep reading... > From what I've read about functions I should be able to define a function > with 2 variables? And then I can add all of my code into that function by > indenting it. That's correct, more or less. So a function with two variables will look like def aFunction(var1,var2): your code here return result > And then shouldn't I be able to > function(float(input("enter input: "))) No because you are only passing one variable into the function - the result of the input)() function. input() is just a function like any other, it takes an input parameter and returns a value. > function(float(input("enter input 2: "))) And again you call your function with a single value. The function has no memory of previous calls so it won't know about your previous attempt with input > return(function) And the return statement needs to be inside the function. It returns the resuilt to the caller of the function. So you really want something like result = function(input('Value1'), input('Value 2')) Although we generally consider using input like that a bad idea. It would be better to write: val1 = input('Value 1') val2 = input('value 2') result = function(val1,val2) It's slightly longer but much easier to debug if things go wrong! > Also, since it'll be in a function, when I type return(function) will it > rerun the code from the top? Every time you type function() it will run the function code afresh. To try to clarify things, here is a very simple function that simply adds two numbers and the code that uses it. def add(val1,val2): total = val1 + val2 return total x = int( input('Val1? ') ) # convert input string to integer y = int( input('Val2? ') ) result = add(x,y) print(x, '+', y, '=', result) #or print("%d + %d = %d" % (x,y,result)) See my tutorial paqe for more examples and a more complete explanation. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
