Return function-CodePudding

i want more understand about return function. Is return function the function have a return value,what is that mean ? Plis give example and explanation about function have a return value and not have a return value.

CodePudding user response：

return is a statement for functions, so let's say you have a bit of code like print(myFunction()). myFunction's return value is what print is printing.

so if I have


# define function
def myFunction():

    # this gives "Hello World" to whatever runs it
    return "Hello World"

# put the return value in a variable
a = myFunction()

# print the variable data
print( a )

when you run a = myFunction the function is returning "Hello World" and storing it in the variable a. then you're just printing value of a.

CodePudding user response：

Think of it this way,

Sometimes you want your function to do something for example add something to a variable:

a = 1

def add_1(x):
    x  = 1

# This would add 1 to the variable a. No return needed.

add_1(a)

# Now a is 2.

but sometimes you would want a function to return something that you could work with. For example printing it or saving it to another variable:

a = 1

def add_1(x):
    return x   1

b = add_1(a)

# The function returns a   1, which is 2, and saves it to the variable b.

print (add_1(b))

# The function prints the returned value of b   1, which is 3 and would print 3.

Hopefully this was helpful.