How do I get a result (output) from a function? How can I use the result later?

by 
def foo():
    x = 'hello world'
    return x  # return 'hello world' would do, too

foo()
print(x)   # NameError - x is not defined outside the function

y = foo()
print(y)   # this works

x = foo()
print(x)   # this also works, and it's a completely different x than that inside
           # foo()

z = bar(x) # of course, now you can use x as you want

z = bar(foo()) # but you don't have to

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