--Originally published at Quirino´s Projects
You get to know the power of programming get you get to functions, functions are a very useful way to reuse code, or a easy way to save a few lines in your code
#In python3 even print is a function print("Hello World")
A function takes an argument, or arguments and work with it.
#To call a function you just need to write its name #And give enough arguments and the correct type #print takes strings, variables hellow = "World" print ("Hello") #prints "Hello" print (hellow) #prints "World" #Functions like print work with different values, but there are some #That need specific types like: print (abs("Hola")) #Would cause error since it needs an int or float print (int(["Hello",42])) #Error since int() doesn't take lists
#Lets review the sum() function #sum() takes an iterable object and returns it sum. Example moneys = [500,700,-330,24,-30] print (sum(moneys)) #Where sum() is the function itself, and moneys its the argument #this would print 864
This function comes included with with python, this means you don’t have to define it as you would with a user created like
#We will get in deep about user defined functions in "Creating functions"
def doubleSum(x,y):
#This funcion takes 2 numbers and returns its double
return 2 * (x + y)
print doubleSum(5,6)
External Links:
[Really useful]
https://docs.python.org/3/library/functions.html
